gelbooruhttps://xbooru.com/index.php?page=atom&tags=1boy 2020s 2023 alternate version available animated skeleton blush bondage bottom sans bound bound arms bound legs grey background legs apart male male only mellouwana monster nude sacrum lacing sans sans (undertale) simple background skeleton solid color background solo solo male string submissive submissive male sweat uke sans undead undertale undertale (series)2024-05-15T16:32:44Zgelbooru