gelbooruhttps://xbooru.com/index.php?page=atom&tags=1boy 2020s 2022 2d 2d (artwork) animated skeleton blue blush blue tentacles blush bottom sans hi res highres legs forced open legs held open male monster naked nude partially colored penetration sans sans (undertale) sex skeleton solo sweat tentacle tentacle around arm tentacle sex tentacles around legs tongue out traditional art traditional media (artwork) uke sans undead undertale undertale (series) varvara tel2024-05-12T04:23:30Zgelbooru