gelbooruhttps://xbooru.com/index.php?page=atom&tags=1:1 1:1 aspect ratio 2boys animated skeleton artist request blush bottom sans hair over one eye humanoid robot male male/male male only mettasans mettaton mettaton ex nervous penis pink background robot robot humanoid sans sans (undertale) seme mettaton simple background skeleton top mettaton uke sans undead undertale undertale (series) yaoi2024-05-14T08:13:06Zgelbooru