Xbooru - 2010s 2018 2boys 2d 2d (artwork) anal animated skeleton artist name big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller blue blush blue penis blush bottom sans bottomless bottomless male brother brother/brother brother and brother brother penetrating brother brothers clothed clothing dated dominant dominant male duo ectopenis fontcest from front position genitals glowing glowing genitalia glowing penis heart-shaped pupils heart eyes incest jacket kneel larger male larger penetrating larger penetrating smaller male male/male male only maledom malesub monster off shoulder orange blush orange penis papyrus papyrus (undertale) papysans penis realdemdemdmensfw sans sans (undertale) seme papyrus sex skeleton small sub small sub big dom smaller male smaller penetrated smaller sub smaller sub bigger dom submissive submissive male sweat top papyrus uke sans undead undertale undertale (series) video game character video games yaoi