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2020s 2022 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_hoodie blue_jacket blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carne_392f carrying carrying_partner clothed dark_background duo ectopenis ectoplasm fellatio fellatio_pov fontcest glowing glowing_genitalia glowing_penis grabbing_legs hooded_jacket 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 multiple_views orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed sans sans_(undertale) seme_papyrus shirt_lift shirt_up sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated top_papyrus uke_sans undead undertale undertale_(series) yaoi

2020s 2022 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_hoodie blue_jacket blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carne_392f carrying carrying_partner clothed dark_background duo ectopenis ectoplasm fellatio fellatio_pov fontcest glowing glowing_genitalia glowing_penis grabbing_legs hooded_jacket 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 multiple_views orange_blush orange_penis papyrus papyrus_(undertale)papysans partially_clothed sans sans_(undertale)seme_papyrus shirt_lift shirt_up sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated top_papyrus uke_sans undead undertale undertale_(series)yaoi

2020s 2022 2boys anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_eyes blue_hoodie blue_jacket blue_penis blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers carne_392f carrying carrying_partner clothed dark_background duo ectopenis ectoplasm fellatio fellatio_pov fontcest glowing glowing_genitalia glowing_penis grabbing_legs hooded_jacket 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 multiple_views orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_clothed sans sans_(undertale) seme_papyrus shirt_lift shirt_up sibling_incest siblings simple_background sitting skeleton smaller_male smaller_penetrated top_papyrus uke_sans undead undertale undertale_(series) yaoi

1:1 1:1_aspect_ratio 2016 2d 2d_(artwork) animated_skeleton anon anonymous_male artist_name blue_blush blue_tongue blush bottom_sans clothed cockotron digital_media_(artwork) faceless_male fellatio fellatio_pov fvdsfs genitals licking licking_penis long_tongue male male_pov monster oral penis penis_in_mouth pink_sweater pov sans sans_(undertale) sex simple_background skeleton solo_focus sweat sweater third-party_source tongue uke_sans undead undertale undertale_(series) unseen_male_face upper_body video_games white_background

2010s 2016 2boys animated_skeleton bottom_sans brothers cigarette comic cum cum_in_mouth duo ectopenis eli-sin-g english_text fellatio fellatio_pov fontcest holding_cigarette incest kolesjoie male male/male male_only male_pov monster oral papyrus papyrus_(undertale) papysans penis sans sans_(undertale) seme_papyrus sequence sequential skeleton text times_new_roman_(undertale) tongue top_papyrus uke_sans undead undertale undertale_(series) yaoi