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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

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 2males animated_skeleton arms_around_another arms_around_another's_neck arms_around_neck bigger_male blue_blush blue_penis blue_tongue blush bottom_sans brother/brother brothers comic comic_page comic_panel comic_sans duo ectopenis ectotongue english_text fontcest gay handjob hands_around_neck incest indoors larger_male male male/male male_only monster orange_blush papyrus papyrus_(undertale) papysans partially_colored penis sans sans_(undertale) seme_papyrus sequence sequential shorter_male skeleton smaller_male soul soul_sex speech_bubble taller_male text text_bubble tongue top_papyrus uke_sans undead undertale undertale_(series) yaoi

13thcatofthegate 2010s 2018 2boys 2males animated_skeleton bigger_male blue_blush blush bottom_sans brother/brother brothers comic comic_page comic_panel comic_sans duo ectotongue english_text fontcest gay incest indoors larger_male licking licking_neck male male/male male_only monster orange_blush orange_tongue papyrus papyrus_(undertale) papysans partially_colored sans sans_(undertale) seme_papyrus sequence sequential shorter_male skeleton smaller_male soul soul_sex speech_bubble taller_male text text_bubble tongue top_papyrus topless topless_male uke_sans undead undertale undertale_(series) yaoi