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1boy 1cuntboy 2010s 2018 animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cuntboy drooling duo ectopenis ectopussy english_text fontcest heart-shaped_pupils hugged_from_behind hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy moaning monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton smaller_penetrated speech_bubble text text_bubble theyaois thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
1boy 1cuntboy 2010s 2018 animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers cuntboy drooling duo ectopenis ectopussy english_text fontcest heart-shaped_pupils hugged_from_behind hugging_from_behind incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/cuntboy moaning monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pussy sans sans_(undertale) seme_papyrus sequence sequential sequential_art sex sibling_incest siblings simple_background skeleton smaller_penetrated speech_bubble text text_bubble theyaois thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers carrying carrying_another carrying_partner clothed clothed_male digital_media_(artwork) duo ectopenis english_text fontcest from_behind heart-shaped_pupils imminent_sex incest intraspecies larger_male male male/male male_only monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penis pink_slippers sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton slippers talking_to_another talking_to_partner text theyaois top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
2010s 2018 2boys 2d 2d_(artwork) animated_skeleton bigger_male blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers carrying carrying_another carrying_partner clothed clothed_male digital_media_(artwork) duo ectopenis english_text fontcest from_behind heart-shaped_pupils imminent_sex incest intraspecies larger_male male male/male male_only monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penis pink_slippers sans sans_(undertale) seme_papyrus sequence sequential sequential_art sibling_incest siblings simple_background skeleton slippers talking_to_another talking_to_partner text theyaois top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi
1boy 1cuntboy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name artist_watermark blue_blush blue_eye blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant_male duo ectopenis ectopussy english_text fontcest gay glowing glowing_eye glowing_genitalia glowing_penis glowing_pussy incest intraspecies laddinger leg_lift legs_up line_art lineart male male/cuntboy male_out_of_frame maledom monster monster_boy naked nude orange_penis papyrus papyrus_(undertale) papysans partial_male partially_colored penis pussy sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive_cuntboy sweat text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games watermark white_background yaoi
1boy 1cuntboy 2010s 2015 2d 2d_(artwork) animated_skeleton artist_name artist_watermark blue_blush blue_eye blue_pussy blush bottom_sans brother/brother brothers clothed clothed/nude clothed_male cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant_male duo ectopenis ectopussy english_text fontcest gay glowing glowing_eye glowing_genitalia glowing_penis glowing_pussy incest intraspecies laddinger leg_lift legs_up line_art lineart male male/cuntboy male_out_of_frame maledom monster monster_boy naked nude orange_penis papyrus papyrus_(undertale) papysans partial_male partially_colored penis pussy sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton solo_focus submissive_cuntboy sweat text top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games watermark white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton bad_id bad_tumblr_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_penis bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed/nude digital_media_(artwork) duo ectopenis fontcest gay grabbing_from_behind grabbing_mouth inactive_account incest larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy noxiousaberration nude open_mouth orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2010s 2015 2boys 2d 2d_(artwork) animated_skeleton bad_id bad_tumblr_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_background blue_penis bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed/nude digital_media_(artwork) duo ectopenis fontcest gay grabbing_from_behind grabbing_mouth inactive_account incest larger_male larger_penetrating larger_penetrating_smaller male male/male male_focus male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy noxiousaberration nude open_mouth orange_penis papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus tongue tongue_grab tongue_out top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
2010s 2017 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers closed_eyes clothed clothed_male digital_media_(artwork) drooling duo facing_another fontcest incest larger_male larger_penetrating larger_penetrating_smaller male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster orange_blush papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sex sinfulsanspar sitting_on_another sitting_position skeleton sketch small_shirt small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom top_papyrus uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi
1boy 1cuntboy 2020s 2021 2d 2d_(artwork) abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother brother/brother brother_and_brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie inactive_account incest jacket kneeling looking_back male maledom monster papyrus papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans sans_(undertale) seme_papyrus skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
1boy 1cuntboy 2020s 2021 2d 2d_(artwork) abosinsin animated_skeleton ass_spanking bad_id bad_twitter_id blue_blush blue_eyes blue_hoodie blue_jacket blue_tongue blush bodily_fluids bottom_sans bottomless brother brother/brother brother_and_brother brothers butt_spanking cuntboy cuntboy_focus cuntboysub digital_media_(artwork) dominant dominant_male duo ectoplasm ectopussy english_text fluids fontcest gloves grabbing_sheets gripping_sheets hand heart-shaped_pupils heart_eyes hooded_jacket hoodie inactive_account incest jacket kneeling looking_back male maledom monster papyrus papyrus_(undertale) papysans pink_socks punishment pussy red_gloves sans sans_(undertale) seme_papyrus skeleton socks solo_focus spank_marks spanking spanking_ass spanking_butt submissive submissive_cuntboy sweat text top_papyrus twitter_username uke_sans undead undertale undertale_(series) unseen_male unseen_male_face video_game_character video_games visible_breath white_background yaoi
>:o 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media_(artwork) duo english_text fontcest gloves grabbing_another's_chin grabbing_face hooded_jacket hoodie implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus papyrus_(undertale) papysans profanity red_gloves red_sweater sans sans_(undertale) seme_papyrus skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
>:o 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton apron bad_id bad_twitter_id big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male blue_blush blue_hoodie blue_jacket blue_tongue blush bottom_sans brothers cussing digital_media_(artwork) duo english_text fontcest gloves grabbing_another's_chin grabbing_face hooded_jacket hoodie implied_incest inactive_account indoors jacket larger_male male monster orange_apron papyrus papyrus_(undertale) papysans profanity red_gloves red_sweater sans sans_(undertale) seme_papyrus skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom swearing sweat sweater text top_papyrus twitter_username uke_sans undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) animated_skeleton bed bedroom big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_jacket blue_penis blue_tongue blush boots bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis ectoplasm ectotongue facing_another fontcest gay gloves glowing glowing_eye glowing_genitalia glowing_penis incest indoors intraspecies jacket larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male mastery_position monster monster_boy on_bed orange_blush orange_penis orange_tongue papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration pink_slippers precum precum_drip precum_on_penis red_boots red_gloves saliva saliva_on_finger sans sans_(undertale) seme_papyrus sex shoes_on sibling_incest siblings sitting_on_bed skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom soul soul_sex sweat text tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger 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 top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
1:1 1:1_aspect_ratio 2010s 2017 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_tongue blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) doggy_position duo ectoplasm finger_in_mouth fingers_in_mouth fontcest from_behind_position grabbing_from_behind grey_background incest intraspecies larger_male larger_penetrating male male/male male_penetrated male_penetrating male_penetrating_male monochrome monster monster_boy off_shoulder orange_blush papyrus papyrus_(undertale) papysans partially_colored penetration penetration_from_behind saliva saliva_on_finger 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 top_papyrus tumblr uke_sans undead undertale undertale_(series) unknown_artist video_game_character video_games yaoi
2boys animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans bottomless bottomless_male brother/brother brothers cum_on_face dinogirl69 duo ectopenis ectotongue fangs fontcest frottage frotting gay incest intraspecies larger_male male male/male male_only monster monster_boy outercourse papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis penis_on_penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
2boys animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bottom_sans bottomless bottomless_male brother/brother brothers cum_on_face dinogirl69 duo ectopenis ectotongue fangs fontcest frottage frotting gay incest intraspecies larger_male male male/male male_only monster monster_boy outercourse papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penis penis_on_penis sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton sketch small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom tongue tongue_out top_papyrus uke_sans undead undertale undertale_(series) white_background yaoi
2010s 2018 2boys animated_skeleton blue_blush blue_tongue bottom_sans brother/brother brothers clothed dominant_pov duo ectotongue fontcest gay gloves grabbing_hand grabbing_mouth hooded_jacket hoodie incest jacket male male/male male_only male_pov monster papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus simple_background skeleton solo_focus submissive top_papyrus uke_sans undead undertale undertale_(series) upper_body veah-3sin yaoi
2010s 2018 2boys animated_skeleton blue_blush blue_tongue bottom_sans brother/brother brothers clothed dominant_pov duo ectotongue fontcest gay gloves grabbing_hand grabbing_mouth hooded_jacket hoodie incest jacket male male/male male_only male_pov monster papyrus papyrus_(undertale) papysans pov sans sans_(undertale) seme_papyrus simple_background skeleton solo_focus submissive top_papyrus uke_sans undead undertale undertale_(series) upper_body veah-3sin yaoi
2boys 2d 2d_(artwork) animated_skeleton artist_name 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 crying drawn drooling erection erection_under_clothes 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 artist_name 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 crying drawn drooling erection erection_under_clothes 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 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_eyes blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothed_sex dakuyakko duo ectopenis erection fontcest genitals heart-shaped_pupils heart_eyes incest intraspecies larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus stand_and_carry_position third-party_source top_papyrus tumblr_username uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2010s 2015 2boys 2d 2d_(artwork) anal animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_eyes blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carrying carrying_another carrying_partner carrying_position clothed clothed_sex dakuyakko duo ectopenis erection fontcest genitals heart-shaped_pupils heart_eyes incest intraspecies larger_male larger_penetrating male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy orange_penis papyrus papyrus_(undertale) papysans penetration penis sans sans_(undertale) seme_papyrus sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom solo_focus stand_and_carry_position third-party_source top_papyrus tumblr_username uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games white_background yaoi
2020s 2021 2boys 2d 2d_(artwork) animated_skeleton beetleevil blue_blush blush blush_lines bottom_sans bottomless brother brother/brother brother_and_brother brothers clothed crying cussing digital_media_(artwork) duo english_text evilbeetle fingering fingering_another fingering_partner fontcest heat hugging in_heat incest intraspecies male male_only monster monster_boy nude papyrus papyrus_(undertale) papysans partially_clothed partially_colored profanity sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton soul speech_bubble swearing text text_bubble top_papyrus topless topless_male uke_sans undead undertale undertale_(series) video_games yaoi
2020s 2021 2boys 2d 2d_(artwork) animated_skeleton beetleevil blue_blush blush blush_lines bottom_sans bottomless brother brother/brother brother_and_brother brothers clothed crying cussing digital_media_(artwork) duo english_text evilbeetle fingering fingering_another fingering_partner fontcest heat hugging in_heat incest intraspecies male male_only monster monster_boy nude papyrus papyrus_(undertale) papysans partially_clothed partially_colored profanity sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton soul speech_bubble swearing text text_bubble top_papyrus topless topless_male uke_sans undead undertale undertale_(series) video_games yaoi
2020s 2021 2d 2d_(artwork) animated_skeleton beetleevil blue_blush blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers clothed crying digital_media_(artwork) english_text evilbeetle fontcest heat hugging in_heat incest intraspecies male_only monochrome monster monster_boy nude oral papyrus papyrus_(undertale) papysans partially_colored pillow sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton soul speech_bubble text text_bubble thought_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
2020s 2021 2d 2d_(artwork) animated_skeleton beetleevil blue_blush blush blush_lines bottom_sans brother brother/brother brother_and_brother brothers clothed crying digital_media_(artwork) english_text evilbeetle fontcest heat hugging in_heat incest intraspecies male_only monochrome monster monster_boy nude oral papyrus papyrus_(undertale) papysans partially_colored pillow sans sans_(undertale) seme_papyrus sibling_incest siblings skeleton soul speech_bubble text text_bubble thought_bubble top_papyrus uke_sans undead undertale undertale_(series) video_games yaoi
2010s 2019 2boys animated_skeleton bigger_male blue_blush blue_hoodie blue_jacket blush bottom_sans brother/brother brothers clothed duo ectotongue fontcest gay glowing hooded_jacket hoodie incest jacket larger_male licking male male/male monster one_eye_closed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_clothed sans sans_(undertale) seme_papyrus simple_background skeleton top_papyrus uke_sans undead undertale undertale_(series) yaoi yellowscarf_(849741021angela)
2010s 2019 2boys animated_skeleton bigger_male blue_blush blue_hoodie blue_jacket blush bottom_sans brother/brother brothers clothed duo ectotongue fontcest gay glowing hooded_jacket hoodie incest jacket larger_male licking male male/male monster one_eye_closed orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_clothed sans sans_(undertale) seme_papyrus simple_background skeleton top_papyrus uke_sans undead undertale undertale_(series) yaoi yellowscarf_(849741021angela)
2boys animated_skeleton blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed dark_background dominant_pov dubious_consent duo english_text fontcest gay imminent_sex incest looking_away male male/male male_only male_pov monster papyrus papyrus_(undertale) papysans pov questionable_consent sans sans_(undertale) seme_papyrus shirt_lift shirt_up simple_background skeleton solo_focus submissive text top_papyrus uke_sans undead undertale undertale_(series) unknown_artist unseen_male_face yaoi
2boys animated_skeleton blue_blush blush bottom_sans brother brother/brother brother_and_brother brothers clothed dark_background dominant_pov dubious_consent duo english_text fontcest gay imminent_sex incest looking_away male male/male male_only male_pov monster papyrus papyrus_(undertale) papysans pov questionable_consent sans sans_(undertale) seme_papyrus shirt_lift shirt_up simple_background skeleton solo_focus submissive text top_papyrus uke_sans undead undertale undertale_(series) unknown_artist unseen_male_face yaoi
1boy 1girl 2d against_the_wall against_wall animated_skeleton artist_request blush canon_x_oc clothed clothed_male digital_media duo ectopenis female female_human female_penetrated femsub from_behind_position glowing glowing_penis hetero human human_penetrated interspecies male male/female male_penetrating male_penetrating_female maledom monochrome monster monster_boy oc_x_canon orange_penis original_character papyrus_(undertale) partially_clothed partially_clothed_female partially_colored penetration seme_papyrus sex sex_from_behind shorter_female skeleton straight taller_male top_papyrus undead undertale undertale_(series) video_game_character video_games
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