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2020s 2021 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans brother/brother brother_penetrating_brother brothers cussing duo ectopenis english_text fontcest gay grabbing_head head_grab heart-shaped_pupils heart_eyes humanoid incest intraspecies irrumatio larger_male larger_penetrating male male/male male_penetrating monochrome monster monster_boy multiple_views papyrus papyrus_(undertale) papysans penetration penis profanity pushing_head_towards_fellatio sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton sketch sleeping small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing text tired_but_horny_(artist) top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi zzz

2020s 2021 2boys 2d 2d_(artwork)animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans brother/brother brother_penetrating_brother brothers cussing duo ectopenis english_text fontcest gay grabbing_head head_grab heart-shaped_pupils heart_eyes humanoid incest intraspecies irrumatio larger_male larger_penetrating male male/male male_penetrating monochrome monster monster_boy multiple_views papyrus papyrus_(undertale)papysans penetration penis profanity pushing_head_towards_fellatio sans sans_(undertale)seme_papyrus sex sibling_incest siblings simple_background skeleton sketch sleeping small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing text tired_but_horny_(artist)top_papyrus twitter uke_sans undead undertale undertale_(series)video_game_character video_games white_background yaoi zzz

2020s 2021 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub big_penis bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller bottom_sans brother/brother brother_penetrating_brother brothers cussing duo ectopenis english_text fontcest gay grabbing_head head_grab heart-shaped_pupils heart_eyes humanoid incest intraspecies irrumatio larger_male larger_penetrating male male/male male_penetrating monochrome monster monster_boy multiple_views papyrus papyrus_(undertale) papysans penetration penis profanity pushing_head_towards_fellatio sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton sketch sleeping small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom swearing text tired_but_horny_(artist) top_papyrus twitter uke_sans undead undertale undertale_(series) video_game_character video_games white_background yaoi zzz

2010s 2016 2boys 2d 2d_(artwork) anal animated_skeleton artist_name big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_penetrating bigger_penetrating_smaller black_border blue_blush blue_penis blue_tongue blush bottom_sans bottomless brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed clothed_male cum cum_string cum_while_penetrated cum_while_penetrating cumming_together cumshot digital_media_(artwork) drooling duo ectopenis ectotongue ejaculation ejaculation_while_penetrated fontcest fully_clothed fully_clothed_male gay gay_sex genital_fluids genitals gloves heki_(miss60250) hooded_jacket hoodie incest intraspecies larger_penetrating larger_penetrating_smaller leg_grab leg_held_up legs_apart male male/male male_only male_penetrating_male monster monster_boy orange_blush orange_penis orgasm papyrus papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves saliva sans sans_(undertale) seme_papyrus sex shirt_up sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom spread_legs submissive tears third-party_source tongue tongue_out top_papyrus tumblr twitter uke_sans undead undertale undertale_(series) 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 bondage bottom_sans brother brothers clothed digital_media_(artwork) duo eggford erection erection_under_clothes fontcest genital_fluids incest kneel kneeling looking_at_another looking_back looking_back_at_another male male/male male_only monster orange_background papyrus papyrus_(undertale) papysans partial_male penis precum precum_through_clothing sans sans_(undertale) seme_papyrus simple_background skeleton small_sub small_sub_big_dom smaller_sub smaller_sub_bigger_dom solo_focus tied_up top_papyrus tumblr uke_sans undead undertale undertale_(series) unseen_male_face video_game_character video_games yaoi