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2010s 2boys alternate_version_available animated_skeleton bottom_sans brother brother/brother brother_and_brother brothers duo eli-sin-g fontcest grabbing_leg incest kolesjoie looking_at_viewer male male/male male_only male_pov monster one_eye_closed papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus sepia skeleton solo_focus top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2010s 2boys alternate_version_available animated_skeleton bottom_sans brother brother/brother brother_and_brother brothers duo eli-sin-g fontcest grabbing_leg incest kolesjoie looking_at_viewer male male/male male_only male_pov monster one_eye_closed papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus sepia skeleton solo_focus top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2010s 2boys animated_skeleton blue_blush blush bottom_sans brothers clothed crying duo eli-sin-g fontcest gay grabbing_head implied_sex incest kissing kolesjoie male male/male male_only monster one_eye_close orange_blush papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus skeleton sweater tears top_papyrus trembling uke_sans undead undertale undertale_(series) upper_body yaoi
2010s 2boys animated_skeleton blue_blush blush bottom_sans brothers clothed crying duo eli-sin-g fontcest gay grabbing_head implied_sex incest kissing kolesjoie male male/male male_only monster one_eye_close orange_blush papyrus papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus skeleton sweater tears top_papyrus trembling uke_sans undead undertale undertale_(series) upper_body yaoi
2017 2boys 2d animated_skeleton bottom_sans brother/brother brothers carrying carrying_partner carrying_position crying duo ectotongue fontcest incest interlocked_fingers intertwined_fingers licking licking_face lowest-of-dirt monster orange_tongue papyrus_(undertale) papysans sans_(undertale) seme_papyrus skeleton tongue top_papyrus traditional_media undead undertale undertale_(series) video_game_character video_games yaoi
2017 2boys 2d animated_skeleton bottom_sans brother/brother brothers carrying carrying_partner carrying_position crying duo ectotongue fontcest incest interlocked_fingers intertwined_fingers licking licking_face lowest-of-dirt monster orange_tongue papyrus_(undertale) papysans sans_(undertale) seme_papyrus skeleton tongue top_papyrus traditional_media undead undertale undertale_(series) video_game_character video_games yaoi
2d 2d_(artwork) ahegao animal animated_skeleton annoying_dog_(undertale) beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork) dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale) papysans reverse_suspended_congress sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi zoophilia
2d 2d_(artwork) ahegao animal animated_skeleton annoying_dog_(undertale) beastiality bigger_penetrating bigger_penetrating_smaller blue_tongue bonetrouble bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers canid canine carrying carrying_partner digital_media_(artwork) dog english_text feral feral_on_male feral_penetrating feral_penetrating_humanoid fontcest heart heart-shaped_pupils heart_eyes hooded_jacket hoodie implied_double_penetration implied_penetration implied_sex incest interspecies intraspecies larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_spread male male/male male/male/male male_ahegao male_only male_penetrating mammal monochrome monster monster_boy papyrus papyrus_(undertale) papysans reverse_suspended_congress sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton smaller_feral smaller_male smaller_penetrating solo_focus source_request spread_legs text threesome toby_fox tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games white_background yaoi zoophilia
2020s 2022 2boys 2d 2d_(artwork) abosinsin anal anal_penetration anal_sex animated_skeleton arms_grab bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_legwear blue_hoodie blue_penis blush bodily_fluids bottom_sans bouncing_penis brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed cussing dialogue digital_media_(artwork) dirty_talk duo ectopenis english_text erect_while_penetrated fluids fontcest from_behind_position fully_clothed gloves grabbing_from_behind head_out_of_frame holding_arms hoodie inactive_account incest intraspecies kneeling larger_dom larger_male larger_penetrating larger_penetrating_smaller leaking_cum legwear male male/male male_only male_out_of_frame male_penetrated male_penetrating male_penetrating_male maledom moan moaning monster monster_boy motion_lines onomatopoeia papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes penis penis_through_clothing pounding prison_guard_position profanity red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smooth_penis swearing sweat text text_bubble thought_bubble thrusting top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2020s 2022 2boys 2d 2d_(artwork) abosinsin anal anal_penetration anal_sex animated_skeleton arms_grab bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_legwear blue_hoodie blue_penis blush bodily_fluids bottom_sans bouncing_penis brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed cussing dialogue digital_media_(artwork) dirty_talk duo ectopenis english_text erect_while_penetrated fluids fontcest from_behind_position fully_clothed gloves grabbing_from_behind head_out_of_frame holding_arms hoodie inactive_account incest intraspecies kneeling larger_dom larger_male larger_penetrating larger_penetrating_smaller leaking_cum legwear male male/male male_only male_out_of_frame male_penetrated male_penetrating male_penetrating_male maledom moan moaning monster monster_boy motion_lines onomatopoeia papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes penis penis_through_clothing pounding prison_guard_position profanity red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smooth_penis swearing sweat text text_bubble thought_bubble thrusting top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton bad_id bad_twitter_id blush bottom_sans brother brother/brother brother_and_brother brothers digital_media_(artwork) duo english_text fontcest from_behind grabbing_hand grabbing_hands hand_on_hand hands_grab imminent_sex implied_sex inactive_account incest intraspecies male male/male male_only monochrome monster monster_boy papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sweat sweating text thought_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton bad_id bad_twitter_id blush bottom_sans brother brother/brother brother_and_brother brothers digital_media_(artwork) duo english_text fontcest from_behind grabbing_hand grabbing_hands hand_on_hand hands_grab imminent_sex implied_sex inactive_account incest intraspecies male male/male male_only monochrome monster monster_boy papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sweat sweating text thought_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male cropped crying drawn drooling edited erection fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d 2d_(artwork) animated_skeleton big_dom_small_sub bigger_dom bigger_dom_smaller_sub blue_blush blue_penis blue_tongue blush bonetrouble bottom_sans brother brother/brother brother_and_brother brothers clothed_male cropped crying drawn drooling edited erection fontcest genitals handjob incest intraspecies kneel male male/male male_only monster monster_boy orange_blush pants_only papyrus papyrus_(undertale) papysans penis penis_grab saliva sans sans_(undertale) seme_papyrus shirtless sibling_incest siblings sitting skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom smaller_submissive tears top_papyrus topless topless_male traditional_media traditional_media_(artwork) uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) against_wall anal animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck artist_name backwards_hat big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_male bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blue_saliva bluetrashsins blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers cap carrying carrying_partner carrying_position digital_media_(artwork) drooling duo ectopenis fontcest gay genitals glowing glowing_eye glowing_penis hands_around_neck hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_blush orange_penis orange_saliva papyrus papyrus_(undertale) papysans penetration red_cap sans sans_(undertale) seme_papyrus sex shirt_only sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stand_and_carry_position suspended_congress tears top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games wall_sex yaoi
2010s 2016 2boys 2d 2d_(artwork) against_wall anal animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck artist_name backwards_hat big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_female bigger_male bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blue_saliva bluetrashsins blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers cap carrying carrying_partner carrying_position digital_media_(artwork) drooling duo ectopenis fontcest gay genitals glowing glowing_eye glowing_penis hands_around_neck hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_blush orange_penis orange_saliva papyrus papyrus_(undertale) papysans penetration red_cap sans sans_(undertale) seme_papyrus sex shirt_only sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom stand_and_carry_position suspended_congress tears top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games wall_sex yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_penis bottom_sans brother brother/brother brother_penetrating_brother brothers completely_nude digital_media_(artwork) duo ectopenis fontcest from_front_position glowing glowing_penis grabbing_leg grabbing_sheets gripping_sheets incest intraspecies male male/male male_only male_penetrating missionary missionary_position monster monster_boy nude orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sheet_grab sibling_incest siblings simple_background sinncognito skeleton tears tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_penis bottom_sans brother brother/brother brother_penetrating_brother brothers completely_nude digital_media_(artwork) duo ectopenis fontcest from_front_position glowing glowing_penis grabbing_leg grabbing_sheets gripping_sheets incest intraspecies male male/male male_only male_penetrating missionary missionary_position monster monster_boy nude orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sheet_grab sibling_incest siblings simple_background sinncognito skeleton tears tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers censor_bar censored_penis clothed clothed_male clothing crying digital_media_(artwork) drooling duo ectopenis ectoplasm english_text fontcest genitals gloves hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_focus male_only male_penetrating mastery_position monster monster_boy motion_lines orange_penis papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus sweat tears text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi
2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_background blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers censor_bar censored_penis clothed clothed_male clothing crying digital_media_(artwork) drooling duo ectopenis ectoplasm english_text fontcest genitals gloves hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male_focus male_only male_penetrating mastery_position monster monster_boy motion_lines orange_penis papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting_on_lap sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom socks solo_focus sweat tears text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi
2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_blush blue_hoodie blue_jacket blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brothers crying cussing digital_media_(artwork) drooling duo ectopenis ectoplasm english_text erect_while_penetrated erection erection_under_clothes fontcest genitals gloves grabbing_arms hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_out_of_frame male_penetrated male_penetrating male_penetrating_male male_pov monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male penetrating_pov penetration penetrator_pov penis penis_size_difference pov profanity red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus swearing sweat tears text top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi
2020s 2021 2boys 2d 2d_(artwork) anal animated_skeleton big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_blush blue_hoodie blue_jacket blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brothers crying cussing digital_media_(artwork) drooling duo ectopenis ectoplasm english_text erect_while_penetrated erection erection_under_clothes fontcest genitals gloves grabbing_arms hooded_jacket hoodie incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_out_of_frame male_penetrated male_penetrating male_penetrating_male male_pov monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male penetrating_pov penetration penetrator_pov penis penis_size_difference pov profanity red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus swearing sweat tears text top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_border xxoxxkm_(pixiv_id_3871107) yaoi
!! 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton artist_signature blue_blush blue_tongue blush bottom_sans bottomless brother brothers crying digital_media_(artwork) ectopenis ectoplasm fontcest genitals humanoid immolationyyx incest male male_focus male_out_of_frame male_penetrating monster monster_boy non-consensual nonconsensual orange_penis papyrus papyrus_(undertale) papysans penetration penis pixiv pixiv_id_9733540 pleading sans sans_(undertale) seme_papyrus sex shirt_only shirt_up skeleton solo_focus speech_bubble sweat tears text tongue top_papyrus trembling tumblr uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
!! 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton artist_signature blue_blush blue_tongue blush bottom_sans bottomless brother brothers crying digital_media_(artwork) ectopenis ectoplasm fontcest genitals humanoid immolationyyx incest male male_focus male_out_of_frame male_penetrating monster monster_boy non-consensual nonconsensual orange_penis papyrus papyrus_(undertale) papysans penetration penis pixiv pixiv_id_9733540 pleading sans sans_(undertale) seme_papyrus sex shirt_only shirt_up skeleton solo_focus speech_bubble sweat tears text tongue top_papyrus trembling tumblr uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) against_wall ahegao animated_skeleton begging blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying clothed clothing crying crying_with_eyes_open digital_media_(artwork) duo english_text fontcest grabbing_clothing implied_penetration implied_sex incest male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy onomatopoeia orange_blush papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton smoochthemskeles tears tears_of_pleasure text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) against_wall ahegao animated_skeleton begging blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying clothed clothing crying crying_with_eyes_open digital_media_(artwork) duo english_text fontcest grabbing_clothing implied_penetration implied_sex incest male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy onomatopoeia orange_blush papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton smoochthemskeles tears tears_of_pleasure text thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_games yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother_penetrating_brother brothers clothed crying crying_with_eyes_open cum digital_media_(artwork) drooling duo ectoplasm fontcest gloves grabbing_legs grabbing_sheets gripping_sheets hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_held_open logo_(pixiv_id_30462562) male male_out_of_frame male_penetrating monster monster_boy orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother_penetrating_brother brothers clothed crying crying_with_eyes_open cum digital_media_(artwork) drooling duo ectoplasm fontcest gloves grabbing_legs grabbing_sheets gripping_sheets hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_held_open logo_(pixiv_id_30462562) male male_out_of_frame male_penetrating monster monster_boy orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother_penetrating_brother brothers clothed crying crying_with_eyes_open cum digital_media_(artwork) drooling duo ectoplasm eyes_wide_open fontcest gloves grabbing_legs grabbing_sheets gripping_sheets hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_held_open logo_(pixiv_id_30462562) male male_out_of_frame male_penetrating monster monster_boy orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother_penetrating_brother brothers clothed crying crying_with_eyes_open cum digital_media_(artwork) drooling duo ectoplasm eyes_wide_open fontcest gloves grabbing_legs grabbing_sheets gripping_sheets hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller legs_apart legs_held_open logo_(pixiv_id_30462562) male male_out_of_frame male_penetrating monster monster_boy orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
1boy 1cuntboy 2020s 2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blush bottom_sans bottomless brother brother_penetrating_brother brothers clothed crying cuntboy digital_media_(artwork) disembodied_hands disembodied_penis drooling ectopenis ectoplasm ectopussy fingers_interlocked fontcest gloves hands hooded_jacket hoodie incest interlocked_fingers intertwined_fingers jacket japanese_text logo_(pixiv_id_30462562) male male/cuntboy male_out_of_frame male_penetrating monster monster_boy one_eye_closed orange_penis papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration penis pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus submissive sweat tears text top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
1boy 1cuntboy 2020s 2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blush bottom_sans bottomless brother brother_penetrating_brother brothers clothed crying cuntboy digital_media_(artwork) disembodied_hands disembodied_penis drooling ectopenis ectoplasm ectopussy fingers_interlocked fontcest gloves hands hooded_jacket hoodie incest interlocked_fingers intertwined_fingers jacket japanese_text logo_(pixiv_id_30462562) male male/cuntboy male_out_of_frame male_penetrating monster monster_boy one_eye_closed orange_penis papyrus papyrus_(undertale) papysans partially_clothed partially_nude penetration penis pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus submissive sweat tears text top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
1boy 1cuntboy 2020s 2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blush bottom_sans bottomless brother brothers clothed cuntboy digital_media_(artwork) disembodied_hands disembodied_penis drooling ectopenis ectoplasm ectopussy fingers_interlocked fontcest gloves hands hooded_jacket hoodie imminent_penetration imminent_sex incest interlocked_fingers intertwined_fingers jacket japanese_text logo_(pixiv_id_30462562) male male/cuntboy male_out_of_frame male_penetrating monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partially_clothed partially_nude penis pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive sweat text top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
1boy 1cuntboy 2020s 2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_pussy blush bottom_sans bottomless brother brothers clothed cuntboy digital_media_(artwork) disembodied_hands disembodied_penis drooling ectopenis ectoplasm ectopussy fingers_interlocked fontcest gloves hands hooded_jacket hoodie imminent_penetration imminent_sex incest interlocked_fingers intertwined_fingers jacket japanese_text logo_(pixiv_id_30462562) male male/cuntboy male_out_of_frame male_penetrating monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partially_clothed partially_nude penis pixiv pussy red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive sweat text top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed digital_media_(artwork) duo ectotongue fontcest fully_clothed gloves hooded_jacket hoodie incest intraspecies jacket logo_(pixiv_id_30462562) looking_at_another looking_at_partner monster monster_boy orange_blush orange_tongue papyrus papyrus_(undertale) papysans pixiv saliva_string saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton submissive sweat tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2022 2d 2d_(artwork) animated_skeleton blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed digital_media_(artwork) duo ectotongue fontcest fully_clothed gloves hooded_jacket hoodie incest intraspecies jacket logo_(pixiv_id_30462562) looking_at_another looking_at_partner monster monster_boy orange_blush orange_tongue papyrus papyrus_(undertale) papysans pixiv saliva_string saliva_trail sans sans_(undertale) seme_papyrus sibling_incest siblings simple_background skeleton submissive sweat tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blush bottom_sans brother brothers clothed crying digital_media_(artwork) drooling fontcest gloves hand_on_another's_head hand_on_head hooded_jacket hoodie hugging implied_penetration implied_sex incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy motion_lines one_eye_closed orange_blush papyrus papyrus_(undertale) papysans partial_male pixiv red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2022 2d 2d_(artwork) animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blush bottom_sans brother brothers clothed crying digital_media_(artwork) drooling fontcest gloves hand_on_another's_head hand_on_head hooded_jacket hoodie hugging implied_penetration implied_sex incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male monster monster_boy motion_lines one_eye_closed orange_blush papyrus papyrus_(undertale) papysans partial_male pixiv red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat tears text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2022 2d 2d_(artwork) animated_skeleton blue_hoodie blue_jacket blush bottom_sans brother brothers clothed digital_media_(artwork) dominant_pov fingers_interlocked fontcest gloves grabbing_hand hooded_jacket hoodie incest interlocked_fingers intertwined_fingers intraspecies jacket japanese_text logo_(pixiv_id_30462562) looking_at_viewer male male_pov monster monster_boy papyrus papyrus_(undertale) papysans pinned_down pixiv pov red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2022 2d 2d_(artwork) animated_skeleton blue_hoodie blue_jacket blush bottom_sans brother brothers clothed digital_media_(artwork) dominant_pov fingers_interlocked fontcest gloves grabbing_hand hooded_jacket hoodie incest interlocked_fingers intertwined_fingers intraspecies jacket japanese_text logo_(pixiv_id_30462562) looking_at_viewer male male_pov monster monster_boy papyrus papyrus_(undertale) papysans pinned_down pixiv pov red_gloves sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless brother brother_penetrating_brother brothers censor_bar clothed digital_media_(artwork) drooling duo ectopenis ectoplasm fluids fontcest genital_fluids genitals hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male mastery_position monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration pixiv sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_lap sitting_on_penis sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2020s 2022 2d 2d_(artwork) anal animated_skeleton bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_censor_bar blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless brother brother_penetrating_brother brothers censor_bar clothed digital_media_(artwork) drooling duo ectopenis ectoplasm fluids fontcest genital_fluids genitals hooded_jacket hoodie incest intraspecies jacket japanese_text larger_male larger_penetrating larger_penetrating_smaller logo_(pixiv_id_30462562) male mastery_position monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration pixiv sans sans_(undertale) seme_papyrus sex sibling_incest siblings sitting sitting_on_lap sitting_on_penis sitting_position skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus submissive sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2boys anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller bottom_sans bottomless brother/brother brothers couch couch_sex crying crying_with_eyes_open doggy_position duo fontcest from_behind from_behind_position gay grabbing_hand hoodie incest intraspecies kneel larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating malicious-muffin_(artist) malicious_muffin_(artist) monster monster_boy on_couch on_sofa papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_couch sex_on_sofa sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sofa tears thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) yaoi
1:1 1:1_aspect_ratio 2boys anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller bottom_sans bottomless brother/brother brothers couch couch_sex crying crying_with_eyes_open doggy_position duo fontcest from_behind from_behind_position gay grabbing_hand hoodie incest intraspecies kneel larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating malicious-muffin_(artist) malicious_muffin_(artist) monster monster_boy on_couch on_sofa papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_couch sex_on_sofa sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sofa tears thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton ass ass_grab blue_ass blue_blush blue_body blue_butt bottom_sans bottomless bottomless_male brother brother_and_brother brothers butt comic digital_media_(artwork) dominant_pov duo ectobody ectobutt ectopenis english_text flower fontcest grabbing_ass hands_on_ass holding_flower hotdogging incest intraspecies looking_at_viewer looking_back looking_back_at_viewer male male_only male_pov malicious-muffin_(artist) malicious_muffin_(artist) moaning monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male partially_colored penis penis_between_ass penis_on_ass pov pov_ass sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus speech_bubble sweater text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton ass ass_grab blue_ass blue_blush blue_body blue_butt bottom_sans bottomless bottomless_male brother brother_and_brother brothers butt comic digital_media_(artwork) dominant_pov duo ectobody ectobutt ectopenis english_text flower fontcest grabbing_ass hands_on_ass holding_flower hotdogging incest intraspecies looking_at_viewer looking_back looking_back_at_viewer male male_only male_pov malicious-muffin_(artist) malicious_muffin_(artist) moaning monster monster_boy orange_penis papyrus papyrus_(undertale) papysans partial_male partially_colored penis penis_between_ass penis_on_ass pov pov_ass sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus speech_bubble sweater text text_bubble top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
2d 2d_(artwork) animated_skeleton bottom_sans bound_wrists brother brothers collar collar_and_leash digital_media_(artwork) ectopenis english_text fontcest incest kneel leash leash_and_collar male male_focus malesub maximum-overboner monochrome monster monster_boy orgasm_denial papyrus papyrus_(undertale) papysans penis pixiv sans sans_(undertale) seme_papyrus skeleton solo_focus submissive_male text text_bubble top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
2d 2d_(artwork) animated_skeleton bottom_sans bound_wrists brother brothers collar collar_and_leash digital_media_(artwork) ectopenis english_text fontcest incest kneel leash leash_and_collar male male_focus malesub maximum-overboner monochrome monster monster_boy orgasm_denial papyrus papyrus_(undertale) papysans penis pixiv sans sans_(undertale) seme_papyrus skeleton solo_focus submissive_male text text_bubble top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face video_game_character video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) abosinsin after_deepthroat after_fellatio after_oral animated_skeleton bad_id bad_twitter_id big_penis blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed coughing digital_media_(artwork) duo ectopenis edit edited english_text fontcest grabbing_head grabbing_penis hoodie huge_penis inactive_account incest male male/male male_only male_out_of_frame monster onomatopoeia orange_penis papyrus papyrus_(undertale) papysans partial_male penis sans sans_(undertale) seme_papyrus skeleton solo_focus speech_bubble text text_bubble thought_bubble tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) abosinsin after_deepthroat after_fellatio after_oral animated_skeleton bad_id bad_twitter_id big_penis blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers clothed coughing digital_media_(artwork) duo ectopenis edit edited english_text fontcest grabbing_head grabbing_penis hoodie huge_penis inactive_account incest male male/male male_only male_out_of_frame monster onomatopoeia orange_penis papyrus papyrus_(undertale) papysans partial_male penis sans sans_(undertale) seme_papyrus skeleton solo_focus speech_bubble text text_bubble thought_bubble tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games yaoi
2020s 2022 2boys 2d 2d_(artwork) abosinsin after_deepthroat after_fellatio after_oral animated_skeleton bad_id bad_twitter_id big_penis blue_blush blue_saliva blue_tongue blush bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers clothed coughing covered_in_cum cum_on_face deepthroat dialogue digital_media_(artwork) dizzy_eyes duo ectopenis ectoplasm english_text excessive_cum face_out_of_frame fellatio fontcest gag gay grabbing_head grabbing_penis head_grab hoodie huge_cock huge_penis inactive_account incest large_penis licking licking_penis long_tongue male male/male male_only male_out_of_frame monster onomatopoeia oral orange_cum orange_penis papyrus papyrus_(undertale) papysans partial_male penis penis_grab saliva saliva_on_penis sans sans_(undertale) seme_papyrus semen_on_face skeleton solo_focus speech_bubble sucking_penis text text_bubble thick_cum thought_bubble throbbing_penis tongue tongue_on_penis tongue_out too_much_cum top_papyrus twitter twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
2020s 2022 2boys 2d 2d_(artwork) abosinsin after_deepthroat after_fellatio after_oral animated_skeleton bad_id bad_twitter_id big_penis blue_blush blue_saliva blue_tongue blush bodily_fluids bottom_sans brother brother/brother brother_and_brother brothers clothed coughing covered_in_cum cum_on_face deepthroat dialogue digital_media_(artwork) dizzy_eyes duo ectopenis ectoplasm english_text excessive_cum face_out_of_frame fellatio fontcest gag gay grabbing_head grabbing_penis head_grab hoodie huge_cock huge_penis inactive_account incest large_penis licking licking_penis long_tongue male male/male male_only male_out_of_frame monster onomatopoeia oral orange_cum orange_penis papyrus papyrus_(undertale) papysans partial_male penis penis_grab saliva saliva_on_penis sans sans_(undertale) seme_papyrus semen_on_face skeleton solo_focus speech_bubble sucking_penis text text_bubble thick_cum thought_bubble throbbing_penis tongue tongue_on_penis tongue_out too_much_cum top_papyrus twitter twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face veiny_penis video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2020s 2022 2boys 2d 2d_(artwork) abosinsin animated_skeleton bad_id bad_twitter_id big_penis blue_blush blue_tongue blush bodily_fluids bone bottom_sans brother brother/brother brother_and_brother brothers can't_see_the_haters digital_media_(artwork) duo ectopenis english_text erection fontcest genital_fluids genitals heart high_res huge_cock huge_penis humanoid inactive_account incest large_penis male male/male male_focus male_only male_out_of_frame meme monster orange_penis papyrus papyrus_(undertale) papysans penis penis_on_face penis_over_eyes precum sans sans_(undertale) seme_papyrus sibling skeleton solo_focus text these_aren't_my_glasses throbbing throbbing_penis tongue tongue_out top_papyrus twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2020s 2022 2boys 2d 2d_(artwork) abosinsin animated_skeleton bad_id bad_twitter_id big_penis blue_blush blue_tongue blush bodily_fluids bone bottom_sans brother brother/brother brother_and_brother brothers can't_see_the_haters digital_media_(artwork) duo ectopenis english_text erection fontcest genital_fluids genitals heart high_res huge_cock huge_penis humanoid inactive_account incest large_penis male male/male male_focus male_only male_out_of_frame meme monster orange_penis papyrus papyrus_(undertale) papysans penis penis_on_face penis_over_eyes precum sans sans_(undertale) seme_papyrus sibling skeleton solo_focus text these_aren't_my_glasses throbbing throbbing_penis tongue tongue_out top_papyrus twitter_username uke_sans undead undertale undertale_(series) veiny_penis video_game_character video_games white_background yaoi
1boy 1cuntboy 2016 2d 3koma animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush book bottom_sans brother/brother brother_penetrating_brother brothers clothed comic comic_panel comic_sans digital_media duo english_text fontcest from_behind_position fully_clothed gloves headphones heart-shaped_pupils heart_eyes holding_book holding_microphone holding_object hooded_jacket hoodie humanoid implied_cuntboy implied_penetration implied_pussy implied_sex implied_vaginal incest intraspecies jacket larger_penetrating larger_penetrating_smaller male microphone mmmemmo monster monster_boy mounting onomatopoeia orange_background orange_blush papyrus_(undertale) papysans penetration_from_behind reading red_gloves sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solid_color_background teeth text top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
1boy 1cuntboy 2016 2d 3koma animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush book bottom_sans brother/brother brother_penetrating_brother brothers clothed comic comic_panel comic_sans digital_media duo english_text fontcest from_behind_position fully_clothed gloves headphones heart-shaped_pupils heart_eyes holding_book holding_microphone holding_object hooded_jacket hoodie humanoid implied_cuntboy implied_penetration implied_pussy implied_sex implied_vaginal incest intraspecies jacket larger_penetrating larger_penetrating_smaller male microphone mmmemmo monster monster_boy mounting onomatopoeia orange_background orange_blush papyrus_(undertale) papysans penetration_from_behind reading red_gloves sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solid_color_background teeth text top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton blush_lines bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers cozmic13 digital_media_(artwork) duo ectopenis fontcest gloves incest intraspecies japanese_text legs_spread line_art lineart male male_focus male_only missionary_position monochrome monster monster_boy papyrus papyrus_(undertale) papysans partial_male partially_clothed penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton socks socks_on solo_focus spoken_heart spread_legs sweat text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton blush_lines bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers cozmic13 digital_media_(artwork) duo ectopenis fontcest gloves incest intraspecies japanese_text legs_spread line_art lineart male male_focus male_only missionary_position monochrome monster monster_boy papyrus papyrus_(undertale) papysans partial_male partially_clothed penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton socks socks_on solo_focus spoken_heart spread_legs sweat text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2boys 2d 2d_(artwork) anal animated_skeleton artist_request blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers covering_own_mouth digital_media_(artwork) duo ectopenis fontcest from_behind_position gloves gloves_only grabbing_sheets gripping_sheets incest intraspecies male male/male male_focus male_only male_out_of_frame monster monster_boy nude pants_around_one_leg papyrus papyrus_(undertale) papysans partial_male penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus source_request sweat third-party_source top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2boys 2d 2d_(artwork) anal animated_skeleton artist_request blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers covering_own_mouth digital_media_(artwork) duo ectopenis fontcest from_behind_position gloves gloves_only grabbing_sheets gripping_sheets incest intraspecies male male/male male_focus male_only male_out_of_frame monster monster_boy nude pants_around_one_leg papyrus papyrus_(undertale) papysans partial_male penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings skeleton solo_focus source_request sweat third-party_source top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2016 2boys 2d animated_skeleton artist_name blue_blush blue_tongue blush_lines bottom_sans brother/brother brothers chinese_text clothed digital_media drooling duo duplicate ectopenis ectotongue english_text face_out_of_frame fellatio finger_pointing fontcest genitals glowing glowing_genitalia glowing_penis hand_on_penis heki_(miss60250) hoodie incest intraspecies letterboxed licking_penis looking_up male male/male male_focus male_only monster monster_boy orange_penis papyrus_(undertale) papysans partial_male penis penis_out saliva sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus sweat sweatdrop text tongue tongue_out top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis yaoi
2016 2boys 2d animated_skeleton artist_name blue_blush blue_tongue blush_lines bottom_sans brother/brother brothers chinese_text clothed digital_media drooling duo duplicate ectopenis ectotongue english_text face_out_of_frame fellatio finger_pointing fontcest genitals glowing glowing_genitalia glowing_penis hand_on_penis heki_(miss60250) hoodie incest intraspecies letterboxed licking_penis looking_up male male/male male_focus male_only monster monster_boy orange_penis papyrus_(undertale) papysans partial_male penis penis_out saliva sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus sweat sweatdrop text tongue tongue_out top_papyrus undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis yaoi
2010s 2016 2d 2d_(artwork) anal animated_skeleton bed big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork) duo ectopenis ectotongue eli-sin-g fontcest incest indoors kolesjoie larger_penetrating larger_penetrating_smaller leg_lift male male_penetrating monster monster_boy off_shoulder off_shoulders on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sex sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2d 2d_(artwork) anal animated_skeleton bed big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans brother brother_and_brother brother_penetrating_brother brothers clothed digital_media_(artwork) duo ectopenis ectotongue eli-sin-g fontcest incest indoors kolesjoie larger_penetrating larger_penetrating_smaller leg_lift male male_penetrating monster monster_boy off_shoulder off_shoulders on_bed orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sex sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2016 2boys anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dirty_talk duo eli-sin-g english_text fontcest from_behind_position gloves grabbing_from_behind grabbing_sheets gripping_sheets hoodie incest intraspecies kolesjoie larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating monster monster_boy onomatopoeia papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble text text_bubble top-down_bottom-up top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2010s 2016 2boys anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothing dirty_talk duo eli-sin-g english_text fontcest from_behind_position gloves grabbing_from_behind grabbing_sheets gripping_sheets hoodie incest intraspecies kolesjoie larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrating monster monster_boy onomatopoeia papyrus papyrus_(undertale) papysans penetration penetration_from_behind sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble text text_bubble top-down_bottom-up top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi
1:1 1:1_aspect_ratio 1boy 1cuntboy 2020s 2022 2d 2d_(artwork) abosinsin animated_skeleton artist_name bad_id bad_twitter_id big_penis bodily_fluids_from_pussy bodily_fluids_on_face bottom_sans brother brothers cum_leaking cum_leaking_out_of_pussy cum_on_face cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dirty_talk dominant_male duo ectopenis ectopussy english_text face_out_of_frame fontcest genitals heart inactive_account incest intraspecies leaking_cum legs_apart legs_spread male male/cuntboy male_out_of_frame maledom monster monster_boy muffled oral oral_sex papyrus papyrus_(undertale) papysans penis penis_in_mouth penis_out punishment pussy pussy_through_clothing sans sans_(undertale) seme_papyrus shaking sibling_incest siblings sitting skeleton sketch solo_focus spread_legs submissive_cuntboy swallowing sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis white_background yaoi
1:1 1:1_aspect_ratio 1boy 1cuntboy 2020s 2022 2d 2d_(artwork) abosinsin animated_skeleton artist_name bad_id bad_twitter_id big_penis bodily_fluids_from_pussy bodily_fluids_on_face bottom_sans brother brothers cum_leaking cum_leaking_out_of_pussy cum_on_face cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dirty_talk dominant_male duo ectopenis ectopussy english_text face_out_of_frame fontcest genitals heart inactive_account incest intraspecies leaking_cum legs_apart legs_spread male male/cuntboy male_out_of_frame maledom monster monster_boy muffled oral oral_sex papyrus papyrus_(undertale) papysans penis penis_in_mouth penis_out punishment pussy pussy_through_clothing sans sans_(undertale) seme_papyrus shaking sibling_incest siblings sitting skeleton sketch solo_focus spread_legs submissive_cuntboy swallowing sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games wet_penis white_background yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo duplicate ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outdoors papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex sweat text text_bubble tongue top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath watermark x-ray yaoi
2010s 2016 2boys 2d 2d_(artwork) animated_skeleton artist_name artist_watermark big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blush bottom_sans brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_sex digital_media_(artwork) drooling duo duplicate ectotongue english_text fangs fontcest from_behind from_behind_position gay gloves heart-shaped_pupils heart_eyes humanoid incest intraspecies jacket laddinger larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy onomatopoeia orange_blush orange_tongue outdoors papyrus papyrus_(undertale) papysans penetration penetration_from_behind penetration_through_clothes public_sex red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex sweat text text_bubble tongue top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games visible_breath watermark x-ray yaoi
1:1 1:1_aspect_ratio 2010s 2019 2d 2d_(artwork) animated_skeleton blanket blue_blush blush bottom_sans brother brother_and_brother brothers cum cum_in_mouth digital_media_(artwork) dream dreaming duo fontcest groping incest intraspecies male monster monster_boy nightcap orange_cum orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pillow pinned sans sans_(undertale) seme_papyrus shirt_lift sibling_incest siblings simple_background skeleton sympharin symphysins tentacle tentacle_sex top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games wet_dream white_background yaoi
1:1 1:1_aspect_ratio 2010s 2019 2d 2d_(artwork) animated_skeleton blanket blue_blush blush bottom_sans brother brother_and_brother brothers cum cum_in_mouth digital_media_(artwork) dream dreaming duo fontcest groping incest intraspecies male monster monster_boy nightcap orange_cum orange_tentacles papyrus papyrus_(undertale) papysans partially_colored penetration pillow pinned sans sans_(undertale) seme_papyrus shirt_lift sibling_incest siblings simple_background skeleton sympharin symphysins tentacle tentacle_sex top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games wet_dream white_background yaoi