Xbooru - 2010s 2017 2boys animated skeleton arm around another's neck arm around neck arm around shoulder big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller blush bottom sans bottomless brother/brother brother penetrating brother brothers carrying carrying partner clothed drooling duo ectopenis fontcest gay grabbing legs incest larger male larger penetrating larger penetrating smaller legs apart legs spread looking down male male/male male penetrating monster papyrus papyrus (undertale) papysans reverse suspended congress sans sans (undertale) seme papyrus sitting skeleton sketch small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom thebrosgf top papyrus uke sans undead undertale undertale (series) white background yaoi