gelbooruhttps://xbooru.com/index.php?page=atom&tags=1boy 2010s animated skeleton blue blush blush bottom sans clothed crossdressing eli-sin-g embarrassed green background hat kolesjoie looking away male male only monster musical instrument sans sans (undertale) simple background skeleton skirt solid color background solo solo male trombone uke sans undead undertale undertale (series) uniform2024-05-13T12:59:00Zgelbooru