Xbooru - 2020 2020s 2boys 2d 2d (artwork) animated skeleton big cock big dom big dom small sub big penis bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller black border blue blush blush boner blossom bottom sans bottomless bottomless male brother/brother brother penetrating brother brothers carrying carrying partner chair clothed comic sans commission art covering another's mouth covering mouth digital media (artwork) drooling duo ectoplasm english text fontcest gay incest larger male larger penetrating male male/male male penetrating moaning monster orange blush outdoor sex outdoors papyrus papyrus (font) papyrus (undertale) papysans penetration public sex reverse suspended congress sans sans (undertale) seme papyrus sex sitting sitting on chair skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom speech bubble sweat text text bubble top papyrus twitter username uke sans undead undertale undertale (series) video game character video games yaoi