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1:1 1:1_aspect_ratio 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brothers chin_grab clothed digital_media_(artwork) duo ectotongue english_text face_grab fontcest food grabbing_another's_chin implied_sex incest licking licking_neck licking_popsicle monster monster_boy multiple_views orange_popsicle orange_tongue papyrus papyrus_(undertale) papysans partially_colored popsicle sans sans_(undertale) seme_papyrus skeleton spoken_musical_note suggestive_food sympharin symphysins text tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2d 2d_(artwork) animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brothers chin_grab clothed digital_media_(artwork) duo ectotongue english_text face_grab fontcest food grabbing_another's_chin implied_sex incest licking licking_neck licking_popsicle monster monster_boy multiple_views orange_popsicle orange_tongue papyrus papyrus_(undertale) papysans partially_colored popsicle sans sans_(undertale) seme_papyrus skeleton spoken_musical_note suggestive_food sympharin symphysins text tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton blue_eyes blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed dark dark_background digital_media_(artwork) fellatio fellatio_pov fontcest genitals glowing glowing_genitalia glowing_penis grabbing_penis incest licking licking_penis male male_only male_pov monster monster_boy oral orange_penis papyrus papyrus_(undertale) papysans penis pov sans sans_(undertale) seme_papyrus sex sinncognito skeleton solo_focus top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games yaoi
2020 2020s 2boys 2d 2d_(artwork) animated_skeleton blue_eyes blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed dark dark_background digital_media_(artwork) fellatio fellatio_pov fontcest genitals glowing glowing_genitalia glowing_penis grabbing_penis incest licking licking_penis male male_only male_pov monster monster_boy oral orange_penis papyrus papyrus_(undertale) papysans penis pov sans sans_(undertale) seme_papyrus sex sinncognito skeleton solo_focus top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games yaoi
2boys animated_skeleton artist_name bad_id bad_twitter_id bottom_sans brothers clothed dark duo fellatio fellatio_pov fontcest glowing glowing_penis inactive_account incest looking_at_viewer male male_only male_pov monster monster_boy papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus skeleton solo_focus top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face xmatsukisinsx yaoi
2boys animated_skeleton artist_name bad_id bad_twitter_id bottom_sans brothers clothed dark duo fellatio fellatio_pov fontcest glowing glowing_penis inactive_account incest looking_at_viewer male male_only male_pov monster monster_boy papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus skeleton solo_focus top_papyrus twitter uke_sans undead undertale undertale_(series) unseen_male unseen_male_face xmatsukisinsx yaoi
2010s 2016 2boys anal animated_skeleton blue_blush blue_penis blush bottom_sans brother_and_brother brother_penetrating_brother brothers duo ectopenis english_text fontcest gay glowing glowing_eye grabbing_penis handjob handjob_while_penetrating heart incest intraspecies jacket male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy orange_blush orange_eye orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton skullysins speech_bubble sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) wearing_others_clothes yaoi
2010s 2016 2boys anal animated_skeleton blue_blush blue_penis blush bottom_sans brother_and_brother brother_penetrating_brother brothers duo ectopenis english_text fontcest gay glowing glowing_eye grabbing_penis handjob handjob_while_penetrating heart incest intraspecies jacket male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy orange_blush orange_eye orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton skullysins speech_bubble sweat text text_bubble top_papyrus uke_sans undead undertale undertale_(series) wearing_others_clothes yaoi
2010s 2boys alternate_version_available animated_skeleton big_penis blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers duo ectopenis eli-sin-g fontcest grabbing_leg incest kolesjoie licking_penis looking_at_viewer male male/male male_only male_pov monster one_eye_closed orange_penis papyrus papyrus_(undertale) papysans penis pov precum sans sans_(undertale) seme_papyrus sepia skeleton solo_focus sweat tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veiny_penis yaoi
2010s 2boys alternate_version_available animated_skeleton big_penis blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers duo ectopenis eli-sin-g fontcest grabbing_leg incest kolesjoie licking_penis looking_at_viewer male male/male male_only male_pov monster one_eye_closed orange_penis papyrus papyrus_(undertale) papysans penis pov precum sans sans_(undertale) seme_papyrus sepia skeleton solo_focus sweat tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face veiny_penis yaoi
2010s 2boys alternate_version_available animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chocolate duo eli-sin-g fontcest food food_play grabbing_leg incest kolesjoie licking_food 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 tongue top_papyrus uke_sans undead undertale undertale_(series) unseen_male_face yaoi
2010s 2boys alternate_version_available animated_skeleton blue_blush blue_tongue blush bottom_sans brother brother/brother brother_and_brother brothers chocolate duo eli-sin-g fontcest food food_play grabbing_leg incest kolesjoie licking_food 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 tongue 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 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
2010s 2018 2d 2d_(artwork) 5koma animated_skeleton artist_signature blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_panel digital_media_(artwork) duo ectotongue fontcest immolationyyx incest making_out monster orange_tongue papyrus papyrus_(undertale) papysans saliva_trail sans sans_(undertale) seme_papyrus sequence sequential skeleton textless tongue tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
2010s 2018 2d 2d_(artwork) 5koma animated_skeleton artist_signature blue_tongue bottom_sans brother brother/brother brother_and_brother brothers clothed clothed_male clothing comic comic_panel digital_media_(artwork) duo ectotongue fontcest immolationyyx incest making_out monster orange_tongue papyrus papyrus_(undertale) papysans saliva_trail sans sans_(undertale) seme_papyrus sequence sequential skeleton textless tongue tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) video_game_character video_games 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
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 2016 2boys anal animated_skeleton blue_blush blue_penis blue_tongue blush bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers duo ectopenis ectotongue fontcest gay gloves incest intraspecies male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sex shirt_only sibling_incest siblings skeleton skullysins table_sex thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) yaoi
2010s 2016 2boys anal animated_skeleton blue_blush blue_penis blue_tongue blush bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers duo ectopenis ectotongue fontcest gay gloves incest intraspecies male male/male male_only male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sex shirt_only sibling_incest siblings skeleton skullysins table_sex thrusting tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) 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
1:1 1:1_aspect_ratio 2010s 2018 2boys anal animated_skeleton artist_name artist_signature ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blue_glans blue_penis blue_tongue blush bottom_sans bottomless bottomless_male bound bound_wrists brother brother/brother brother_and_brother brother_penetrating_brother brothers choker clothed collar doggy_position duo ectobody ectopenis ectotongue fontcest from_behind from_behind_position gay handcuffed handcuffs incest larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwgarbagedump orange_blush orange_body papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis pixiv_id_36285069 restrained restraints sans 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 socks socks_on tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
1:1 1:1_aspect_ratio 2010s 2018 2boys anal animated_skeleton artist_name artist_signature ass big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_body blue_glans blue_penis blue_tongue blush bottom_sans bottomless bottomless_male bound bound_wrists brother brother/brother brother_and_brother brother_penetrating_brother brothers choker clothed collar doggy_position duo ectobody ectopenis ectotongue fontcest from_behind from_behind_position gay handcuffed handcuffs incest larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwgarbagedump orange_blush orange_body papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis pixiv_id_36285069 restrained restraints sans 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 socks socks_on tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
1boy 1cuntboy 2010s 2018 2boys 2d 2d_(artwork) anal animated_skeleton ass ass_up bed bedroom big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bookshelf bottom_sans bottomless bottomless_cuntboy bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers cuntboy cuntboy_penetrated digital_media_(artwork) doggy_position duo ectopenis ectopussy fontcest from_behind from_behind_position genitals gloves incest indoors larger_penetrating larger_penetrating_smaller male male_penetrating_cuntboy monster monster_boy nsfwgarbagedump on_bed one_eye_closed orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed penetration penetration_from_behind penis pixiv pixiv_id_36285069 pussy red_gloves sans sans_(undertale) seme_papyrus sex sex_from_behind sex_on_bed sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom top-down_bottom-up top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
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2010s 2017 2boys anal animated_skeleton bed_sheet bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_hoodie blue_jacket blue_penis blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed duo ectopenis fingers_interlocked fontcest from_front_position gay gay_sex gloves grabbing_sheets gripping_sheets hooded_jacket hoodie incest indoors interlocked_fingers intertwined_fingers intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male missionary_position mmmemmo monster monster_boy orange_blush papyrus papyrus_(undertale) papysans penetration penis red_gloves sans sans_(undertale) seme_papyrus sequence sequential sequential_art sequential_set sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat top_papyrus uke_sans undead undertale undertale_(series) visible_breath 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
2010s 2016 2boys animated_skeleton artist_signature bigger_dom bigger_dom_smaller_sub bigger_male biting blue_blush blue_hoodie blue_jacket blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers clothed dated deviantart fangs fontcest fully_clothed gloves gradient_background hooded_jacket hoodie humanoid imminent_rape imminent_sex incest jacket larger_male male male/male male_only monster monster_boy non-consensual nonconsensual off_shoulder one_eye_closed papyrus papyrus_(undertale) papysans red_gloves sans sans_(undertale) segamew seme_papyrus signature skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom sweat top_papyrus uke_sans undead undertale undertale_(series) undertale_fanfiction yaoi
2010s 2016 2boys animated_skeleton artist_signature bigger_dom bigger_dom_smaller_sub bigger_male biting blue_blush blue_hoodie blue_jacket blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers clothed dated deviantart fangs fontcest fully_clothed gloves gradient_background hooded_jacket hoodie humanoid imminent_rape imminent_sex incest jacket larger_male male male/male male_only monster monster_boy non-consensual nonconsensual off_shoulder one_eye_closed papyrus papyrus_(undertale) papysans red_gloves sans sans_(undertale) segamew seme_papyrus signature skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom sweat top_papyrus uke_sans undead undertale undertale_(series) undertale_fanfiction 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