Xbooru - 1:1 1:1 aspect ratio 2010s 2018 2boys anal animated skeleton artist name artist signature big dom big dom small sub bigger dom bigger dom smaller sub bigger penetrating bigger penetrating smaller blue blush blue body blue glans blue penis blue tongue blush bottom sans bottomless bottomless male bound bound wrists brother brother/brother brother and brother brother penetrating brother brothers choker clothed collar doggy position duo ectobody ectopenis ectotongue fontcest from behind from behind position gay handcuffed handcuffs incest larger penetrating larger penetrating smaller male male/male male only male penetrated male penetrating male penetrating male monster nsfwgarbagedump orange blush orange body papyrus papyrus (undertale) papysans partially clothed penetration penetration from behind penis pixiv id 36285069 restrained restraints sans sans (undertale) seme papyrus sex sex from behind simple background skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom socks socks on tongue tongue out top papyrus uke sans undead undertale undertale (series) white background yaoi