Xbooru - 2010s 2015 2boys 2d 2d (artwork) anal animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller blue eyes blue penis blush bottom sans brother brother/brother brother and brother brother penetrating brother brothers carrying carrying another carrying partner carrying position clothed clothed sex dakuyakko duo ectopenis erection fontcest genitals heart-shaped pupils heart eyes incest larger male larger penetrating male male/male male only male penetrated male penetrating male penetrating male monster orange penis papyrus papyrus (undertale) papysans penetration penis sans sans (undertale) seme papyrus sex sex through clothes sex through clothing skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom solo focus stand and carry position third-party source top papyrus tumblr username uke sans undead undertale undertale (series) unseen male face video game character video games white background yaoi