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2019 2boys 2d alternate_version_available anal animated_gif animated_skeleton animation artist_name artist_signature big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless brother/brother brother_penetrating_brother brothers digital_media duo ectopenis fontcest ganzooky gif gloves incest intraspecies larger_male larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_only male_penetrating monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves sans_(undertale) sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thrusting top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi

2019 2boys 2d alternate_version_available anal animated_gif animated_skeleton animation artist_name artist_signature big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless brother/brother brother_penetrating_brother brothers digital_media duo ectopenis fontcest ganzooky gif gloves incest intraspecies larger_male larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_only male_penetrating monster monster_boy orange_blush orange_penis papyrus_(undertale)papysans partially_clothed partially_clothed_male penetration penis red_gloves sans_(undertale)sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thrusting top_papyrus undead undertale undertale_(series)video_game_character video_games yaoi

2019 2boys 2d alternate_version_available anal animated_gif animated_skeleton animation artist_name artist_signature big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans bottomless brother/brother brother_penetrating_brother brothers digital_media duo ectopenis fontcest ganzooky gif gloves incest intraspecies larger_male larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_only male_penetrating monster monster_boy orange_blush orange_penis papyrus_(undertale) papysans partially_clothed partially_clothed_male penetration penis red_gloves sans_(undertale) sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom thrusting top_papyrus undead undertale undertale_(series) video_game_character video_games yaoi

2018 2boys 2d alternate_costume animated_skeleton blue_blush blue_clothes blue_clothing blue_dress blue_shirt blush bottom_sans bottomless bottomless_skirt brother/brother brothers clothed crossdressing digital_media duo english_text fontcest ganzooky gay kneel male male/male monster orange_blush papyrus_(undertale) papysans sans_(undertale) siblings simple_background sitting skeleton socks teeth text top_papyrus undead undertale undertale_(series) unzipped unzipped_pants video_game_character video_games white_background yaoi

2010s 2019 2boys 2d 2d_(artwork) animated_skeleton big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush bottom_sans bottomless bottomless_male brother brother/brother brother_and_brother brother_penetrating_brother brothers digital_media_(artwork) duo ectopenis english_text fontcest from_front_position ganzooky gay holding_object holding_phone hoodie hoodie_only incest intraspecies larger_male larger_penetrating larger_penetrating_smaller male male/male male_only male_penetrated male_penetrating male_penetrating_male monster monster_boy nsfwsinningsans orange_blush orange_penis pants_only papyrus papyrus_(undertale) papysans penetration phone phone_call sans sans_(undertale) seme_papyrus sex sibling_incest siblings simple_background skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom sweat talking_on_phone text thrusting top_papyrus topless topless_male uke_sans undead undertale undertale_(series) undertale_fanfiction video_game_character video_games white_background yaoi