Xbooru - 2boys 2d 2d (artwork) 2males animated skeleton arm support artist request blue blush blue penis blush bottom sans clothed cute penis digital media (artwork) ectopenis english text gay grey background groping hair hooded jacket hoodie humanoid humanoid robot jacket leg between thighs looking away male male/male male only mettasans mettaton mettaton ex monochrome monster partially colored penis penis through fly robot robot boy robot humanoid sans sans (undertale) seme mettaton shirt lift shirt pulled up shirt up simple background skeleton small penis solid color background sweat text text bubble top mettaton uke sans undead undertale undertale (series) video game character video games yaoi