Xbooru - 2010s 2017 2boys animated skeleton bed bedroom blanket boner boner in pants bottom sans brother brother/brother brother and brother brothers clothed clothing comic comic page comic panel dry humping duo erection erection under clothes fontcest glowing glowing genitalia humping incest indoors laying on bed lying on bed male male/male male only monochrome on bed papyrus papyrus (undertale) papysans partially colored sans sans (undertale) seme papyrus sequence sequential skeleton supermuuh top papyrus uke sans undead under blanket undertale undertale (series) unseen male face yaoi