Xbooru - 1boy 2d 2d (artwork) 2d animation anal anal penetration animated skeleton arms behind back blinking blush bottom sans bottomless crying digital media (artwork) drooling ectobody ectopenis hands behind back legs apart legs spread male male only malesub monochrome penetration penis sans sans (undertale) sex skeleton small penis solo male spread legs submissive male sweat tears tentacle tentacle on male tentacle penetration tentacle sex tentacles around legs tentacles on male uke sans undead undertale undertale (series) unknown artist unknown source video games