Xbooru - 2020s 2022 2boys 2d 2d (artwork) all fours animated skeleton antler headband bell collar blue blush blue body blue hoodie blue jacket blush boots bottom sans boxers (clothing) brother brother/brother brother and brother brothers candle candles christmas christmas present christmas sock christmas tree clothed collar digital media (artwork) duo ectobody ectopenis ectotongue fellatio fontcest gift box gloves hand on another's head holidays hooded jacket hoodie incest indoors jacket living room male male/male male only merry christmas monster oral oral sex orange blush orange penis orange tongue pants on floor pants removed papyrus papyrus (undertale) papysans penis red boots red gloves red hoodie red jacket red socks sans sans (undertale) santa hat seme papyrus sex sinncognito sitting sitting on floor skeleton socks socks on sucking penis top papyrus uke sans undead undertale undertale (series) video games yaoi