Xbooru - 2010s 2015 2boys 2d 2d (artwork) 2males animated skeleton arm support bad id bad tumblr id big penis bigger male blue background bodily fluids bottom sans brother brother/brother brother and brother brothers closed eyes clothed clothed male clothing digital media (artwork) duo ectopenis ectotongue erection fellatio fluids fontcest genitals gloves hooded jacket hoodie incest jacket larger male male male/male male only monster noxiousaberration open mouth oral orange penis orange tongue papyrus papyrus (undertale) papysans partially colored penis penis grab penis through clothing sans sans (undertale) scarf seme papyrus sex skeleton smaller male solo focus sweat testicles third-party source tongue top papyrus uke sans undead undertale undertale (series) video games yaoi