Xbooru - 2010s 2018 2boys 2d 2d (artwork) anal animated skeleton artist name ball gag big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller bondage bottom sans bound brother brother/brother brother and brother brother penetrating brother brothers clothed clothing dated dominant dominant male duo ectopenis ectotongue fellatio fontcest from front position gagged gay sex grey background handjob humping incest jacket kabedon larger male larger penetrating larger penetrating smaller legs apart licking licking penis male male/male male only maledom malesub missionary position monster mouth gag multiple views nude off shoulder papyrus papyrus (undertale) papysans penetration penetration from behind penis realdemdemdmensfw restrained restraints sans sans (undertale) seme papyrus sex sex from behind simple background skeleton small sub small sub big dom smaller male smaller penetrated smaller sub smaller sub bigger dom solid color background submissive submissive male thrusting thrusting into ass tongue tongue out top papyrus uke sans undead undertale undertale (series) video game character video games yaoi