gelbooruhttps://xbooru.com/index.php?page=atom&tags=1boy 2010s 2018 animated skeleton artist name blue background blue blush blush completely naked completely nude full body gradient background heart looking at viewer male male only monster nude sans sans (undertale) sansgasmic-kun simple background skeleton solo solo male undead undertale undertale (series)2024-05-15T10:52:34Zgelbooru