Xbooru - 2020s 2021 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 blush bottom sans bottomless bottomless male brother brother/brother brother and brother brother penetrating brother brothers completely nude completely nude male digital media (artwork) duo ectopenis ectoplasm fluids fontcest from front position genitals goma dango 555 incest larger male larger penetrating larger penetrating smaller lying on back lying on bed male male only male penetrating missionary position monster nude nude male on back on bed orange blush orange penis papyrus papyrus (undertale) papysans penetration penetration from front penis pillow 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 sweat tears toony top papyrus trembling uke sans undead undertale undertale (series) video game character video games visible breath yaoi