Xbooru - 2010s 2017 2boys anal anal penetration anal sex animated skeleton balls bed bedroom blanket blue blush blue body blush bottom sans brother brother/brother brother and brother brother penetrating brother brothers clothed clothing comic comic page comic panel crying crying with eyes open duo ectobody ectopenis fontcest glowing glowing eye incest indoors laying on bed lying on bed male male/male male only male penetrated male penetrating male penetrating male monochrome on bed on side orange balls orange blush orange body orange penis orange testicles papyrus papyrus (undertale) papysans partially colored penetration penis penis in anus sans sans (undertale) seme papyrus sequence sequential sex sex on bed skeleton supermuuh tears testicles top papyrus uke sans undead undertale undertale (series) yaoi