Xbooru - 2010s 2016 2boys 2d 2d (artwork) against wall ahegao animated skeleton begging blue blush blue tongue blush bottom sans brother brother/brother brother and brother brother penetrating brother brothers carrying clothed clothing crying crying with eyes open digital media (artwork) duo english text fontcest grabbing clothing implied penetration implied sex incest male male/male male only male penetrated male penetrating male penetrating male monochrome onomatopoeia orange blush papyrus papyrus (undertale) papysans partially colored sans sans (undertale) seme papyrus sex skeleton smoochthemskeles tears tears of pleasure text thrusting tongue tongue out top papyrus uke sans undead undertale undertale (series) unseen male face video games yaoi