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1boy almost_caught animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel ectopenis eli-sin-g english_text female fontcest frisk frisk_(undertale) from_front_position grabbing_leg human incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series) unseen_character yaoi

1boy almost_caught animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel ectopenis eli-sin-g english_text female fontcest frisk frisk_(undertale)from_front_position grabbing_leg human incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale)papysans penetration sans sans_(undertale)seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series)unseen_character yaoi

1boy almost_caught animated_skeleton anthro big_dom big_dom_small_sub bigger_dom bigger_dom_smaller_sub bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blush bottom_sans brother brother/brother brother_and_brother brother_penetrating_brother brothers clothed comic comic_page comic_panel ectopenis eli-sin-g english_text female fontcest frisk frisk_(undertale) from_front_position grabbing_leg human incest intraspecies kitchen kolesjoie larger_male larger_penetrating leg_grab male male_focus male_penetrating monochrome monster monster_boy orange_blush orange_penis papyrus papyrus_(undertale) papysans penetration sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings skeleton small_sub small_sub_big_dom smaller_penetrated smaller_sub smaller_sub_bigger_dom speech_bubble spot_color stealth_sex text text_bubble top_papyrus toriel uke_sans undead undertale undertale_(series) unseen_character yaoi

1boy 1boy1girl 1girl 2d 2d_(artwork) aged_up animated_skeleton blush breasts clothed clothed/nude clothed_male clothed_male_nude_female digital_media_(artwork) duo ectopenis ectotongue female female_frisk female_human female_penetrated femsub frisk frisk_(undertale) from_front_position grabbing_leg hair_over_eyes hetero human human_penetrated humanoid humanoid_penetrating interspecies leg_grab male male/female male_penetrating male_penetrating_female maledom monochrome monster monster_boy nipples nude nude_female nude_female_clothed_male one_eye_closed onomatopoeia orange_eye orange_penis orange_tongue papyrisk papyrus papyrus_(undertale) penetration saliva saliva_trail seme_papyrus sex skeleton straight top_papyrus undead undertale undertale_(series) video_game_character video_games zed_(artist)

2010s 2016 2boys animated_skeleton blue_blush blue_hoodie blue_jacket blush bottom_sans bottomless brother/brother brothers duo fontcest gay gloves grabbing_leg hooded_jacket hoodie imminent_sex incest jacket leg_grab male male/male monster orange_blush papyrus papyrus_(undertale) papysans red_gloves red_scarf sans sans_(undertale) scarf seme_papyrus skeleton top_papyrus topless topless_male typhadog uke_sans undead undertale undertale_(series) yaoi