Xbooru - 2020s 2022 2boys 2d 2d (artwork) anal animated skeleton bed bedroom big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller blue blush blue tongue blush bottom sans bottomless bottomless male brother brother/brother brother and brother brother penetrating brother brothers clock clothed curtains duo ectopenis ectoplasm fontcest from front position genitals goma dango 555 incest indoors larger male larger penetrating larger penetrating smaller male male only male penetrating mastery position monster night on bed orange blush orange penis papyrus papyrus (undertale) papysans partially clothed penetration penetration from front penis pixiv id 49095896 sans sans (undertale) seme papyrus sex sex from front sex on bed skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom socks socks on toony top papyrus uke sans undead undertale undertale (series) video games wall clock window yaoi