Xbooru - 2020s 2022 2boys anal animated skeleton bigger male bigger penetrating bigger penetrating smaller blue blush blue eyes blue hoodie blue jacket blue penis blush bottom sans brother brother/brother brother and brother brother penetrating brother brothers carne 392f carrying carrying partner clothed dark background duo ectopenis ectoplasm fellatio fellatio pov fontcest glowing glowing genitalia glowing penis grabbing legs hooded jacket hoodie incest jacket larger male larger penetrating larger penetrating smaller male male/male male only male penetrated male penetrating male penetrating male monster multiple views orange blush orange penis papyrus papyrus (undertale) papysans partially clothed sans sans (undertale) seme papyrus shirt lift shirt up simple background sitting skeleton smaller male smaller penetrated top papyrus uke sans undead undertale undertale (series) yaoi