Xbooru - !!! 2010s 2018 2boys 2d 2d (artwork) after deepthroat after fellatio after oral animated skeleton bigger male blue blush blue tongue blush bottom sans brothers clothed clothed male covering own mouth deepthroat digital media (artwork) duo ectopenis ectotongue edit edited english text fellatio fontcest hand on another's head hand on head imminent fellatio imminent oral incest larger male licking penis long image male male/male male only moaning monster multiple images oral orange blush orange penis papyrus papyrus (undertale) papysans penis sans sans (undertale) seme papyrus sequence sequential sequential art sex simple background skeleton solo focus spoken exclamation mark sucking penis talking talking to another talking to partner tall image text theyaois third-party edit tongue top papyrus trembling uke sans undead undertale undertale (series) video games white background yaoi