Xbooru - 2010s 2017 2boys 2d 2d (artwork) animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub bigger male blue blush blush bondage bottom sans brothers clothed digital media (artwork) duo eggford erection erection under clothes fontcest genital fluids incest kneel kneeling looking at another looking back looking back at another male male/male male only monster orange background papyrus papyrus (undertale) papysans penis precum precum through clothing sans sans (undertale) seme papyrus simple background skeleton small sub small sub big dom smaller sub smaller sub bigger dom solo focus tied up top papyrus uke sans undead undertale undertale (series) unseen male face video game character video games