Xbooru - 2010s 2016 2boys animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub blindfold blindfolded blue tongue bottom sans bottomless female cussing drooling duo english text from behind groping hair over one eye hand in pants humanoid humanoid robot implied handjob male male/male male only mettasans mettaton mettaton ex moaning profanity robot robot humanoid sans sans (undertale) seme mettaton shirt lift shirt up skeleton small sub small sub big dom smaller sub smaller sub bigger dom swearing text tinyskeletonfucker tongue tongue out top mettaton uke sans undead undertale undertale (series) white background yaoi