Xbooru - 2020 2020s 2boys 2d 2d (artwork) animated skeleton blue eyes blue tongue bottom sans brother brother/brother brother and brother brothers clothed dark background digital media (artwork) fellatio fellatio pov fontcest genitals glowing glowing genitalia glowing penis grabbing penis incest licking licking penis male male only male pov monster oral orange penis papyrus papyrus (undertale) papysans penis pov sans sans (undertale) seme papyrus sex sinncognito skeleton solo focus top papyrus uke sans undead undertale undertale (series) unseen male unseen male face video game character video games yaoi