Xbooru - 2010s 2015 2boys 2d 2d (artwork) ahegao ambiguous penetration animated skeleton blue jacket blush bottom sans bottomless brother/brother brother and brother brother penetrating brother brothers calciumchan cussing digital media (artwork) duo english text fontcest gloves incest jacket male male ahegao male only male out of frame male penetrated male penetrating male penetrating male moaning papyrus papyrus (undertale) papysans penetration profanity red gloves sans sans (undertale) seme papyrus sex skeleton solo focus swearing sweat text third-party source thrusting tongue tongue out top papyrus uke sans undead undertale undertale (series) unseen male face video games white background yaoi