Xbooru - 1:1 1:1 aspect ratio 2boys 2d 2d (artwork) animated skeleton artist request blush boots bottom sans digital media (artwork) hair hair over one eye humanoid humanoid robot male male/male male only mettasans mettaton mettaton ex nervous penis pink background pink boots robot robot boy robot humanoid sans sans (undertale) seme mettaton simple background skeleton top mettaton uke sans undead undertale undertale (series) video game character video games yaoi