Xbooru - 1:1 1:1 aspect ratio 2010s 2018 2boys animated skeleton big dom small sub big penis bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller bottom sans brother brother/brother brother and brother brothers clothed clothed/nude crying drooling duo ectopenis fontcest gloves huge cock huge penis incest larger male larger penetrating larger penetrating smaller male male only male out of frame male penetrating monster naked nsfwgarbagedump nude male orange penis papyrus papyrus (undertale) papysans partially colored penetration penis sans sans (undertale) seme papyrus sex size difference skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom solo focus top papyrus uke sans undead undertale undertale (series) unseen male face white background