Xbooru - 1girl 2010s 2018 2d 2d (artwork) animated skeleton anus ass blue anus blue ass blue blush blue body blue butt blue pussy blush bottom sans bottomless bottomless skirt butt digital media (artwork) ectobody ectobutt ectopussy english text feet out of frame genderswap genderswap (mtf) humiliated humiliation looking at viewer looking back monster no panties nsfwgarbagedump pixiv id 36285069 presenting anus presenting pussy pussy rule 63 sans sans (undertale) simple background skeleton skirt solo speech bubble text text bubble uke sans undead under skirt undertale undertale (series) video game character video games white background