gelbooruhttps://xbooru.com/index.php?page=atom&tags=2boys animated skeleton blush bottom sans clothed/nude doggy position frans (ship) frisk frisk (undertale) from behind from behind position hooded jacket hoodie human interspecies male frisk male human male only monochrome pixiv id 12036582 sans sans (undertale) skeleton sketch uke sans undertale undertale (series)2024-05-12T11:38:41Zgelbooru