Xbooru - 2boys 2d 2d (artwork) animated skeleton bimbaloon blue eyes blue tongue bottom sans brothers clothed dark background digital media (artwork) duo ectotongue fellatio fellatio pov fontcest glowing cum grabbing penis hi res incest licking penis littlegreendorito long tongue looking at viewer male male focus male only male pov monster oral orange body orange penis papyrus papyrus (undertale) papysans penis pov pov eye contact sans sans (undertale) seme papyrus skeleton solo focus third-party source tongue top papyrus tumblr username uke sans undead undertale undertale (series) unseen male face upper body video game character video games