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2017 2boys 2d animal animated_skeleton annoying_dog_(undertale) bottom_sans brother/brother brothers canid canine canis clothed clothed_male clothing comic comic_panel comic_sans digital_media dog domestic_dog english_text feral fontcest hoodie incest jacket lowest-of-dirt male male/male male_only monster pants_bulge papyrus_(font) papyrus_(undertale) papysans pinned_down sans_(undertale) seme_papyrus skeleton speech_bubble talking_to_another teeth text top_papyrus undead undertale undertale_(series) video_game_character video_games white_background yaoi
2017 2boys 2d animal animated_skeleton annoying_dog_(undertale) bottom_sans brother/brother brothers canid canine canis clothed clothed_male clothing comic comic_panel comic_sans digital_media dog domestic_dog english_text feral fontcest hoodie incest jacket lowest-of-dirt male male/male male_only monster pants_bulge papyrus_(font) papyrus_(undertale) papysans pinned_down sans_(undertale) seme_papyrus skeleton speech_bubble talking_to_another teeth text top_papyrus undead undertale undertale_(series) video_game_character video_games white_background yaoi
2022 2boys 2d anal animated_skeleton artist_name artist_watermark begging_for_more blue_blush blush blush_lines blushing_male bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background humanoid incest intraspecies male male/male male_only maledom malesub moaning monster monster_boy orange_blush papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans_(undertale) sex sex_from_front sibling_incest siblings simple_background skeleton solid_color_background stand_and_carry_position standing submissive submissive_male suspended_congress swearing sweat tel_a_friend text top_papyrus undead undertale undertale_(series) video_game_character video_games watermark yaoi
2022 2boys 2d anal animated_skeleton artist_name artist_watermark begging_for_more blue_blush blush blush_lines blushing_male bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying_another carrying_partner carrying_position clothed clothing comic_sans cussing digital_media dominant dominant_male duo ectoplasm empath__life english_text fontcest from_front_position glowing glowing_genitalia grey_background humanoid incest intraspecies male male/male male_only maledom malesub moaning monster monster_boy orange_blush papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penetration_from_front profanity sans_(undertale) sex sex_from_front sibling_incest siblings simple_background skeleton solid_color_background stand_and_carry_position standing submissive submissive_male suspended_congress swearing sweat tel_a_friend text top_papyrus undead undertale undertale_(series) video_game_character video_games watermark yaoi
! 2022 2boys 2d abosinsin animated_skeleton aroused artist_name bad_id bad_twitter_id bigger_male blush blushing_male brother/brother brothers clothed clothing comic_sans digital_media drinking_straw duo ectotongue english_text fontcest humanoid implied_incest inactive_account larger_male male male/male male_only monster monster_boy orange_tongue papyrus_(font) papyrus_(undertale) papysans plastic_cup sans_(undertale) siblings size_difference skeleton smaller_male speech_bubble talking talking_to_another text tongue twitter_username undead undertale undertale_(series) upper_body video_game_character video_games visible_breath white_background yaoi
! 2022 2boys 2d abosinsin animated_skeleton aroused artist_name bad_id bad_twitter_id bigger_male blush blushing_male brother/brother brothers clothed clothing comic_sans digital_media drinking_straw duo ectotongue english_text fontcest humanoid implied_incest inactive_account larger_male male male/male male_only monster monster_boy orange_tongue papyrus_(font) papyrus_(undertale) papysans plastic_cup sans_(undertale) siblings size_difference skeleton smaller_male speech_bubble talking talking_to_another text tongue twitter_username undead undertale undertale_(series) upper_body video_game_character video_games visible_breath white_background yaoi
2010s 2boys 2d animated_skeleton blue_blush blush bondage bottom_sans bottomless bound_wrists brother/brother brothers comic comic_page comic_panel comic_sans digital_media duo eli-sin-g english_text fontcest humanoid incest intraspecies kneel kolesjoie looking_at_viewer male male/male male_only monster orange_blush papyrus_(font) papyrus_(undertale) papysans pun sacrum_lacing sans_(undertale) sequential sibling_incest siblings skeleton speech_bubble submissive text tied_up top-down_bottom-up undead undertale undertale_(series) yaoi
2010s 2boys 2d animated_skeleton blue_blush blush bondage bottom_sans bottomless bound_wrists brother/brother brothers comic comic_page comic_panel comic_sans digital_media duo eli-sin-g english_text fontcest humanoid incest intraspecies kneel kolesjoie looking_at_viewer male male/male male_only monster orange_blush papyrus_(font) papyrus_(undertale) papysans pun sacrum_lacing sans_(undertale) sequential sibling_incest siblings skeleton speech_bubble submissive text tied_up top-down_bottom-up undead undertale undertale_(series) yaoi
1boy 1cuntboy 2016 2d animated_skeleton blanket bottom_sans brother/brother brother_penetrating_brother brothers comic comic_page couch couch_sex cum cum_in_pussy cuntboy cuntboysub digital_media dominant_male duo ectopenis ectopussy edit eli-sin-g english_text fontcest from_front_position humanoid imminent_sex incest intraspecies kolesjoie long_image male male/cuntboy male_penetrating maledom monster monster_boy multiple_images on_couch papyrus_(font) papyrus_(undertale) papysans pussy sans_(undertale) sequential sex sibling_incest siblings skeleton submissive_cuntboy tall_image text third-party_edit top_papyrus undead undertale undertale_(series) veiny_penis video_games yaoi
1boy 1cuntboy 2016 2d animated_skeleton blanket bottom_sans brother/brother brother_penetrating_brother brothers comic comic_page couch couch_sex cum cum_in_pussy cuntboy cuntboysub digital_media dominant_male duo ectopenis ectopussy edit eli-sin-g english_text fontcest from_front_position humanoid imminent_sex incest intraspecies kolesjoie long_image male male/cuntboy male_penetrating maledom monster monster_boy multiple_images on_couch papyrus_(font) papyrus_(undertale) papysans pussy sans_(undertale) sequential sex sibling_incest siblings skeleton submissive_cuntboy tall_image text third-party_edit top_papyrus undead undertale undertale_(series) veiny_penis video_games yaoi
..... 2018 2boys 2d ?! animated_skeleton bedroom_eyes big_penis bigger_male book books bottom_sans brother/brother brothers clothed clothing comic comic_page comic_panel comic_sans cum cum_on_face cumshot desk digital_media duo ectopenis edit ejaculation english_text fallen9choirs fontcest gay handjob heart holding holding_pencil humanoid incest indoors intraspecies larger_male long_image lying male male/male male_only monster multiple_images on_back on_stomach orange_cum paper papyrus_(font) papyrus_(undertale) papysans pencil penis sans_(undertale) sequential sibling_incest siblings skeleton smaller_male speech_bubble talking tall_image text third-party_edit top_papyrus tumblr_username undead undertale undertale_(series) video_games yaoi
..... 2018 2boys 2d ?! animated_skeleton bedroom_eyes big_penis bigger_male book books bottom_sans brother/brother brothers clothed clothing comic comic_page comic_panel comic_sans cum cum_on_face cumshot desk digital_media duo ectopenis edit ejaculation english_text fallen9choirs fontcest gay handjob heart holding holding_pencil humanoid incest indoors intraspecies larger_male long_image lying male male/male male_only monster multiple_images on_back on_stomach orange_cum paper papyrus_(font) papyrus_(undertale) papysans pencil penis sans_(undertale) sequential sibling_incest siblings skeleton smaller_male speech_bubble talking tall_image text third-party_edit top_papyrus tumblr_username undead undertale undertale_(series) video_games yaoi
2018 2boys 2d animated_skeleton bigger_male brother/brother brothers clothed clothing comic comic_page comic_panel comic_sans digital_media duo english_text fallen9choirs fontcest heart humanoid incest indoors intraspecies larger_male lying male male/male male_only monster on_back papyrus_(font) papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton smaller_male speech_bubble text undead undertale undertale_(series) yaoi
2018 2boys 2d animated_skeleton bigger_male brother/brother brothers clothed clothing comic comic_page comic_panel comic_sans digital_media duo english_text fallen9choirs fontcest heart humanoid incest indoors intraspecies larger_male lying male male/male male_only monster on_back papyrus_(font) papyrus_(undertale) papysans sans_(undertale) sequential sibling_incest siblings skeleton smaller_male speech_bubble text undead undertale undertale_(series) yaoi
..... 2018 2boys 2d ?! animated_skeleton big_penis bigger_male bottom_sans brother/brother brothers clothed clothing comic comic_page comic_panel comic_sans cum cum_on_face cumshot digital_media duo ectopenis ejaculation english_text fallen9choirs fontcest gay handjob humanoid incest indoors intraspecies larger_male male male/male male_only monster orange_cum papyrus_(font) papyrus_(undertale) papysans penis sans_(undertale) sequential sibling_incest siblings skeleton smaller_male speech_bubble text top_papyrus undead undertale undertale_(series) yaoi
..... 2018 2boys 2d ?! animated_skeleton big_penis bigger_male bottom_sans brother/brother brothers clothed clothing comic comic_page comic_panel comic_sans cum cum_on_face cumshot digital_media duo ectopenis ejaculation english_text fallen9choirs fontcest gay handjob humanoid incest indoors intraspecies larger_male male male/male male_only monster orange_cum papyrus_(font) papyrus_(undertale) papysans penis sans_(undertale) sequential sibling_incest siblings skeleton smaller_male speech_bubble text top_papyrus undead undertale undertale_(series) yaoi
2018 2boys 2d animated_skeleton bedroom_eyes bigger_male book books brothers clothed clothing comic comic_page comic_panel comic_sans desk digital_media duo english_text fallen9choirs fontcest holding holding_pencil humanoid imminent_incest indoors larger_male lying male male_only monster on_stomach paper papyrus_(font) papyrus_(undertale) papysans pencil sans_(undertale) sequential skeleton smaller_male speech_bubble text tumblr_username undead undertale undertale_(series)
2018 2boys 2d animated_skeleton bedroom_eyes bigger_male book books brothers clothed clothing comic comic_page comic_panel comic_sans desk digital_media duo english_text fallen9choirs fontcest holding holding_pencil humanoid imminent_incest indoors larger_male lying male male_only monster on_stomach paper papyrus_(font) papyrus_(undertale) papysans pencil sans_(undertale) sequential skeleton smaller_male speech_bubble text tumblr_username undead undertale undertale_(series)
2016 2boys 2d animated_skeleton blue_tongue bottom_sans brother brother/brother brothers clothed comic comic_panel comic_sans digital_media duo ectopenis ectotongue edit english_text fellatio fellatio_pov fontcest genitals hand_on_another's_head humanoid incest intraspecies long_image male male/male male_only male_pov monochrome monster monster_boy multiple_images orange_penis papyrus_(font) papyrus_(undertale) papysans partially_colored penis penis_out pov sans_(undertale) sequential sibling_incest siblings skeleton sucking_penis talking tall_image teeth text third-party_edit tombone-jack tomis-jb tongue top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2016 2boys 2d animated_skeleton blue_tongue bottom_sans brother brother/brother brothers clothed comic comic_panel comic_sans digital_media duo ectopenis ectotongue edit english_text fellatio fellatio_pov fontcest genitals hand_on_another's_head humanoid incest intraspecies long_image male male/male male_only male_pov monochrome monster monster_boy multiple_images orange_penis papyrus_(font) papyrus_(undertale) papysans partially_colored penis penis_out pov sans_(undertale) sequential sibling_incest siblings skeleton sucking_penis talking tall_image teeth text third-party_edit tombone-jack tomis-jb tongue top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
1:1 1:1_aspect_ratio 1boy 2023 2d animated_skeleton artist_name bathing bathroom bathtub blue_blush blue_cum blue_penis blush bubble_bath comic_sans covering_mouth covering_own_mouth cum cumshot digital_media door ectopenis ejaculation english_text fallen_ghost_angel_(artist) genitals humanoid male male_masturbation male_only masturbation monster monster_boy papyrus_(font) papyrus_(undertale) penile penile_masturbation penis profanity sans_(undertale) sequential skeleton solo_focus solo_male speech_bubble surprised text undead undertale undertale_(series) unseen_character variant_set video_game_character video_games
1:1 1:1_aspect_ratio 1boy 2023 2d animated_skeleton artist_name bathing bathroom bathtub blue_blush blue_cum blue_penis blush bubble_bath comic_sans covering_mouth covering_own_mouth cum cumshot digital_media door ectopenis ejaculation english_text fallen_ghost_angel_(artist) genitals humanoid male male_masturbation male_only masturbation monster monster_boy papyrus_(font) papyrus_(undertale) penile penile_masturbation penis profanity sans_(undertale) sequential skeleton solo_focus solo_male speech_bubble surprised text undead undertale undertale_(series) unseen_character variant_set video_game_character video_games
2021 2boys 2d abosinsin anal animated_skeleton bad_id bad_twitter_id big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blue_tongue blush boots bottom_on_top bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothed_sex digital_media duo ectopenis ectotongue edit edited erect_while_penetrated erection fontcest gay genitals hand_on_another's_shoulder hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart looking_pleasured lying male male/male male_only male_penetrated male_penetrating male_penetrating_male moaning monster monster_boy open_mouth orange_blush orange_penis overstimulation papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penis penis_size_difference pleasure_face sans_(undertale) service_top sex sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_penis smaller_male smaller_penetrated smooth_penis sweat tears tears_of_pleasure text third-party_edit tongue tongue_grab tongue_out top_papyrus twitter_username undead undertale undertale_(series) veiny_penis video_game_character video_games x-ray yaoi
2021 2boys 2d abosinsin anal animated_skeleton bad_id bad_twitter_id big_penis bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blue_tongue blush boots bottom_on_top bottom_sans brother/brother brother_penetrating_brother brothers closed_eyes clothed clothed_sex digital_media duo ectopenis ectotongue edit edited erect_while_penetrated erection fontcest gay genitals hand_on_another's_shoulder hooded_jacket hoodie inactive_account incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller line_art lineart looking_pleasured lying male male/male male_only male_penetrated male_penetrating male_penetrating_male moaning monster monster_boy open_mouth orange_blush orange_penis overstimulation papyrus_(font) papyrus_(undertale) papysans partially_colored penetration penis penis_size_difference pleasure_face sans_(undertale) service_top sex sex_through_clothes sex_through_clothing sibling_incest siblings size_difference skeleton small_penis smaller_male smaller_penetrated smooth_penis sweat tears tears_of_pleasure text third-party_edit tongue tongue_grab tongue_out top_papyrus twitter_username undead undertale undertale_(series) veiny_penis video_game_character video_games x-ray yaoi
animated_skeleton artist_request ball_gag blindfold blindfolded bottom_sans bottomless dildo english_text fontcest grey_background implied_incest implied_yaoi incest kidnapped male_only monochrome monster muffled out_of_frame papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus simple_background skeleton solid_color_background solo_focus speech_bubble text text_bubble tied_arms tied_up top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face vibrator
animated_skeleton artist_request ball_gag blindfold blindfolded bottom_sans bottomless dildo english_text fontcest grey_background implied_incest implied_yaoi incest kidnapped male_only monochrome monster muffled out_of_frame papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) seme_papyrus simple_background skeleton solid_color_background solo_focus speech_bubble text text_bubble tied_arms tied_up top_papyrus uke_sans undead undertale undertale_(series) unseen_character unseen_male unseen_male_face vibrator
2017 2boys 2d animated_skeleton blue_blush blush boots bottom_sans brother/brother brothers clothed clothing comic_sans couch dark digital_media duo english_text fontcest gay grabbing_leg grope grope_from_behind groping groping_from_behind hand_in_pants hand_under_clothes humanoid imminent_sex incest indoors intraspecies male male/male monochrome monster on_couch one_eye_closed orange_blush pants papyrus_(font) papyrus_(undertale) papysans partially_colored sans_(undertale) shirt shirt_up sibling_incest siblings sitting skeleton sofa sweat text top_papyrus touching_crotch undead undertale undertale_(series) unknown_artist yaoi
2017 2boys 2d animated_skeleton blue_blush blush boots bottom_sans brother/brother brothers clothed clothing comic_sans couch dark digital_media duo english_text fontcest gay grabbing_leg grope grope_from_behind groping groping_from_behind hand_in_pants hand_under_clothes humanoid imminent_sex incest indoors intraspecies male male/male monochrome monster on_couch one_eye_closed orange_blush pants papyrus_(font) papyrus_(undertale) papysans partially_colored sans_(undertale) shirt shirt_up sibling_incest siblings sitting skeleton sofa sweat text top_papyrus touching_crotch undead undertale undertale_(series) unknown_artist yaoi
2010s 2boys 2d animated_skeleton blue_blush blush bondage bottom_sans bound_wrists brother/brother brothers comic comic_page comic_panel comic_sans digital_media duo eli-sin-g english_text fontcest humanoid implied_incest incest intraspecies kolesjoie male male/male male_only monster orange_blush papyrus_(font) papyrus_(undertale) papysans pun sacrum_lacing sans_(undertale) sequential sibling_incest siblings skeleton speech_bubble teeth text tied_up undead undertale undertale_(series) yaoi
2010s 2boys 2d animated_skeleton blue_blush blush bondage bottom_sans bound_wrists brother/brother brothers comic comic_page comic_panel comic_sans digital_media duo eli-sin-g english_text fontcest humanoid implied_incest incest intraspecies kolesjoie male male/male male_only monster orange_blush papyrus_(font) papyrus_(undertale) papysans pun sacrum_lacing sans_(undertale) sequential sibling_incest siblings skeleton speech_bubble teeth text tied_up undead undertale undertale_(series) yaoi
1boy 1cuntboy 2016 2d animated_skeleton bottom_sans brother/brother brother_penetrating_brother brothers comic comic_page cum cum_in_pussy cuntboy cuntboy_penetrated cuntboysub digital_media dominant_male duo ectopenis ectopussy eli-sin-g english_text fontcest genitals humanoid incest intraspecies kolesjoie male male/cuntboy male_penetrating male_penetrating_cuntboy maledom monster papyrus_(font) papyrus_(undertale) papysans penetration penis pussy sans_(undertale) sequential sex sibling_incest siblings skeleton submissive_cuntboy teeth text top_papyrus undead undertale undertale_(series) vaginal veiny_penis video_game_character video_games yaoi
1boy 1cuntboy 2016 2d animated_skeleton bottom_sans brother/brother brother_penetrating_brother brothers comic comic_page cum cum_in_pussy cuntboy cuntboy_penetrated cuntboysub digital_media dominant_male duo ectopenis ectopussy eli-sin-g english_text fontcest genitals humanoid incest intraspecies kolesjoie male male/cuntboy male_penetrating male_penetrating_cuntboy maledom monster papyrus_(font) papyrus_(undertale) papysans penetration penis pussy sans_(undertale) sequential sex sibling_incest siblings skeleton submissive_cuntboy teeth text top_papyrus undead undertale undertale_(series) vaginal veiny_penis video_game_character video_games yaoi
2016 2d animated_skeleton blanket brothers comic comic_page couch digital_media duo eli-sin-g english_text fontcest humanoid imminent_incest imminent_sex kolesjoie male monster on_couch papyrus_(font) papyrus_(undertale) papysans sans_(undertale) sequential siblings skeleton teeth text undead undertale undertale_(series) video_games
2016 2d animated_skeleton blanket brothers comic comic_page couch digital_media duo eli-sin-g english_text fontcest humanoid imminent_incest imminent_sex kolesjoie male monster on_couch papyrus_(font) papyrus_(undertale) papysans sans_(undertale) sequential siblings skeleton teeth text undead undertale undertale_(series) video_games
2016 2d animated_skeleton blanket brothers comic comic_page digital_media duo eli-sin-g english_text fontcest humanoid imminent_incest imminent_sex kolesjoie male monster papyrus_(font) papyrus_(undertale) papysans sans_(undertale) sequential siblings skeleton teeth text undead undertale undertale_(series) video_games
2016 2d animated_skeleton blanket brothers comic comic_page digital_media duo eli-sin-g english_text fontcest humanoid imminent_incest imminent_sex kolesjoie male monster papyrus_(font) papyrus_(undertale) papysans sans_(undertale) sequential siblings skeleton teeth text undead undertale undertale_(series) video_games
2020 2boys 2d anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_border blue_blush blush boner_blossom bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying carrying_partner chair clothed comic_sans commission covering_another's_mouth covering_mouth digital_media drooling duo ectoplasm english_text fontcest gay humanoid incest intraspecies larger_male larger_penetrating male male/male male_penetrating moaning monster monster_boy orange_blush outdoor_sex outdoors pants pants_around_one_leg papyrus_(font) papyrus_(undertale) papysans penetration public_sex reverse_suspended_congress sans_(undertale) sex sibling_incest siblings sitting sitting_on_chair skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stool sweat text top_papyrus twitter_username undead undertale undertale_(series) video_game_character video_games yaoi
2020 2boys 2d anal animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller black_border blue_blush blush boner_blossom bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers carrying carrying_partner chair clothed comic_sans commission covering_another's_mouth covering_mouth digital_media drooling duo ectoplasm english_text fontcest gay humanoid incest intraspecies larger_male larger_penetrating male male/male male_penetrating moaning monster monster_boy orange_blush outdoor_sex outdoors pants pants_around_one_leg papyrus_(font) papyrus_(undertale) papysans penetration public_sex reverse_suspended_congress sans_(undertale) sex sibling_incest siblings sitting sitting_on_chair skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stool sweat text top_papyrus twitter_username 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
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 arms_crossed bad_id bad_twitter_id blue_blush blush brothers comic crossed_arms digital_media_(artwork) fontcest grin imminent_incest imminent_yaoi inactive_account joke male male_only monochrome monster monster_boy papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) siblings skeleton smile smug undead undertale undertale_(series) video_game_character video_games
1:1 1:1_aspect_ratio 2020s 2021 2d 2d_(artwork) abosinsin anger_vein angry animated_skeleton arms_crossed bad_id bad_twitter_id blue_blush blush brothers comic crossed_arms digital_media_(artwork) fontcest grin imminent_incest imminent_yaoi inactive_account joke male male_only monochrome monster monster_boy papyrus papyrus_(font) papyrus_(undertale) papysans sans sans_(undertale) siblings skeleton smile smug undead undertale undertale_(series) video_game_character video_games
2016 2boys 2d animated_skeleton blue_tongue bottom_sans brother/brother brothers clothed comic comic_panel digital_media duo ectopenis ectotongue english_text fellatio fellatio_pov fontcest genitals hand_on_another's_head humanoid incest intraspecies male male/male male_only male_pov monochrome monster monster_boy oral orange_penis papyrus_(font) papyrus_(undertale) papysans partially_colored penis penis_out pov sans_(undertale) sequential sibling_incest siblings skeleton sucking_penis teeth text tombone-jack tomis-jb tongue top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2016 2boys 2d animated_skeleton blue_tongue bottom_sans brother/brother brothers clothed comic comic_panel digital_media duo ectopenis ectotongue english_text fellatio fellatio_pov fontcest genitals hand_on_another's_head humanoid incest intraspecies male male/male male_only male_pov monochrome monster monster_boy oral orange_penis papyrus_(font) papyrus_(undertale) papysans partially_colored penis penis_out pov sans_(undertale) sequential sibling_incest siblings skeleton sucking_penis teeth text tombone-jack tomis-jb tongue top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2016 2boys 2d animated_skeleton bottom_sans brother brother/brother brothers clothed comic comic_panel comic_sans digital_media duo ectopenis english_text fellatio fontcest genitals hand_on_another's_head humanoid incest intraspecies male male/male male_only monochrome monster monster_boy oral orange_penis papyrus_(font) papyrus_(undertale) papysans partially_colored penis penis_out sans_(undertale) sequential sibling_incest siblings skeleton sucking_penis teeth text tombone-jack tomis-jb top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2016 2boys 2d animated_skeleton bottom_sans brother brother/brother brothers clothed comic comic_panel comic_sans digital_media duo ectopenis english_text fellatio fontcest genitals hand_on_another's_head humanoid incest intraspecies male male/male male_only monochrome monster monster_boy oral orange_penis papyrus_(font) papyrus_(undertale) papysans partially_colored penis penis_out sans_(undertale) sequential sibling_incest siblings skeleton sucking_penis teeth text tombone-jack tomis-jb top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
1girl 2018 2boys 2d alphys animated_skeleton anthro big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother/brother brother_penetrating_brother brothers buckteeth comic comic_panel comic_sans digital_media dinosaur dinosaur_girl ectopenis english_text fallen9choirs female female_anthro fontcest furniture gay genitals humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest indoors intraspecies kotatsu larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/male male_penetrated male_penetrating male_penetrating_male monster monster_boy monster_girl orange_blush orange_penis papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_size_difference reptile reptile_girl sans_(undertale) scalie scalie_female sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex text text_bubble top_papyrus trio undead undertale undertale_(series) yaoi yellow_body yellow_skin
1girl 2018 2boys 2d alphys animated_skeleton anthro big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother/brother brother_penetrating_brother brothers buckteeth comic comic_panel comic_sans digital_media dinosaur dinosaur_girl ectopenis english_text fallen9choirs female female_anthro fontcest furniture gay genitals humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest indoors intraspecies kotatsu larger_penetrating larger_penetrating_smaller lizard lizard_girl male male/male male_penetrated male_penetrating male_penetrating_male monster monster_boy monster_girl orange_blush orange_penis papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penis penis_size_difference reptile reptile_girl sans_(undertale) scalie scalie_female sex sex_through_clothes sex_through_clothing sibling_incest siblings skeleton small_penis small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble stealth_sex text text_bubble top_papyrus trio undead undertale undertale_(series) yaoi yellow_body yellow_skin
2018 2d 3koma animated_skeleton bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers comic comic_panel comic_sans couch digital_media drooling duo ectopenis elbow_gloves english_text fallen9choirs fontcest furniture gay gloves humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest intraspecies larger_penetrating larger_penetrating_smaller long_gloves lying male male/male male_only male_penetrating male_penetrating_male monster monster_boy on_back orange_blush orange_penis papyrus_(font) papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration power_bottom red_gloves red_scarf sans_(undertale) scarf sex sibling_incest siblings skeleton smaller_penetrated speech_bubble sweat text thought_bubble top_papyrus topwear undead undertale undertale_(series) yaoi
2018 2d 3koma animated_skeleton bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_on_top bottom_sans bottomless bottomless_male brother/brother brother_penetrating_brother brothers comic comic_panel comic_sans couch digital_media drooling duo ectopenis elbow_gloves english_text fallen9choirs fontcest furniture gay gloves humanoid humanoid_penetrated humanoid_penetrating humanoid_penetrating_humanoid incest intraspecies larger_penetrating larger_penetrating_smaller long_gloves lying male male/male male_only male_penetrating male_penetrating_male monster monster_boy on_back orange_blush orange_penis papyrus_(font) papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration power_bottom red_gloves red_scarf sans_(undertale) scarf sex sibling_incest siblings skeleton smaller_penetrated speech_bubble sweat text thought_bubble top_papyrus topwear undead undertale undertale_(series) yaoi
2boys 2d anal animated_skeleton artist_request 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 blush boots bottom_sans brother/brother brother_penetrating_brother brothers clothed clothed_male clothed_sex comic_sans cuddle cuddle_sex cum cum_inside digital_media duo ectopenis ejaculation english_text fluids fontcest footwear gay genital_fluids genitals gloves hood hooded_jacket hoodie hugged_from_behind hugging hugging_from_behind incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller lying male male/male male_masturbation male_only male_penetrated male_penetrating male_penetrating_male masturbating_while_penetrated masturbation monster monster_boy multiple_ejaculation multiple_orgasms on_back orange_blush orange_penis papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penile penile_masturbation penis penis_out penis_through_clothing pink_slippers red_boots red_gloves sans_(undertale) sex sex_through_clothes sex_through_clothing shoes shoes_on sibling_incest siblings skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom source_request spread_legs third-party_source top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi
2boys 2d anal animated_skeleton artist_request 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 blush boots bottom_sans brother/brother brother_penetrating_brother brothers clothed clothed_male clothed_sex comic_sans cuddle cuddle_sex cum cum_inside digital_media duo ectopenis ejaculation english_text fluids fontcest footwear gay genital_fluids genitals gloves hood hooded_jacket hoodie hugged_from_behind hugging hugging_from_behind incest intraspecies jacket larger_male larger_penetrating larger_penetrating_smaller lying male male/male male_masturbation male_only male_penetrated male_penetrating male_penetrating_male masturbating_while_penetrated masturbation monster monster_boy multiple_ejaculation multiple_orgasms on_back orange_blush orange_penis papyrus_(font) papyrus_(undertale) papysans penetration penetration_through_clothes penile penile_masturbation penis penis_out penis_through_clothing pink_slippers red_boots red_gloves sans_(undertale) sex sex_through_clothes sex_through_clothing shoes shoes_on sibling_incest siblings skeleton slippers small_sub small_sub_big_dom smaller_male smaller_penetrated smaller_sub smaller_sub_bigger_dom source_request spread_legs third-party_source top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi