Xbooru - 1boy 2010s 2015 2d 2d (artwork) ahegao animated skeleton blue tentacles blue tongue bottom sans bottomless clothed clothing cockotron digital media (artwork) drooling fvdsfs jacket jacket only male male ahegao male focus male only malesub monochrome monster partially clothed partially nude sans sans (undertale) simple background skeleton solo solo focus submissive submissive male tentacle tentacles tentacles around arms tentacles around legs tentacles around wrists tongue tongue out tumblr username uke sans undead undertale undertale (series) video games