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13thcatofthegate 2010s 2018 2boys 2d 2d_(artwork)2males anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother/brother brothers comic comic_page comic_panel comic_sans completely_nude completely_nude_male digital_media_(artwork)duo ectopenis english_text fontcest gay genitals hugged_from_behind hugging hugging_from_behind incest indoors larger_male larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_only monster naked nude nude_male orange_blush orange_penis papyrus papyrus_(undertale)papysans partially_colored penetration penis sans sans_(undertale)seme_papyrus sequence sequential sex shorter_male skeleton smaller_male smaller_penetrated speech_bubble taller_male text text_bubble top_papyrus uke_sans undead undertale undertale_(series)undressed video_game_character video_games yaoi

13thcatofthegate 2010s 2018 2boys 2d 2d_(artwork) 2males anal animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_penis blush bottom_sans brother/brother brothers comic comic_page comic_panel comic_sans completely_nude completely_nude_male digital_media_(artwork) duo ectopenis english_text fontcest gay genitals hugged_from_behind hugging hugging_from_behind incest indoors larger_male larger_penetrating larger_penetrating_smaller looking_at_another looking_at_partner male male/male male_only monster naked nude nude_male orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis sans sans_(undertale) seme_papyrus sequence sequential sex shorter_male skeleton smaller_male smaller_penetrated speech_bubble taller_male text text_bubble top_papyrus uke_sans undead undertale undertale_(series) undressed video_game_character video_games yaoi

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1boy 1cuntboy 2010s 2018 2d 2d_(artwork) animated_skeleton bigger_male bigger_penetrating bigger_penetrating_smaller blue_blush blue_pussy blush bottom_sans brother_penetrating_brother brothers carrying carrying_another carrying_partner clothed clothed_male cuntboy digital_media_(artwork) drooling duo ectopenis ectopussy edit edited english_text fontcest from_behind heart-shaped_pupils hugged_from_behind hugging_from_behind imminent_sex incest intraspecies larger_male larger_penetrating larger_penetrating_smaller long_image male male/cuntboy moaning monster monster_boy multiple_images orange_blush orange_penis papyrus papyrus_(undertale) papysans partially_colored penetration penis pink_slippers pussy sans sans_(undertale) seme_papyrus sequence sequential sex sibling_incest siblings simple_background skeleton slippers smaller_penetrated speech_bubble talking talking_to_another talking_to_partner tall_image text text_bubble theyaois third-party_edit thrusting thrusting_into_pussy top_papyrus uke_sans undead undertale undertale_(series) video_games white_background yaoi