Xbooru - 1boy 1cuntboy 2010s 2018 2d 2d (artwork) animated skeleton bigger male bigger penetrating bigger penetrating smaller blue blush blue pussy blush bottom sans brother penetrating brother brothers carrying carrying another carrying partner clothed clothed male cuntboy digital media (artwork) drooling duo ectopenis ectopussy edit edited english text fontcest from behind heart-shaped pupils hugged from behind hugging from behind imminent sex incest larger male larger penetrating larger penetrating smaller long image male male/cuntboy moaning monster multiple images orange blush orange penis papyrus papyrus (undertale) papysans partially colored penetration penis pink slippers pussy sans sans (undertale) seme papyrus sequence sequential sex simple background skeleton slippers smaller penetrated speech bubble talking talking to another talking to partner tall image text text bubble theyaois third-party edit thrusting thrusting into pussy top papyrus uke sans undead undertale undertale (series) video games white background yaoi