Xbooru - 2010s 2017 2boys animated skeleton bottom sans clothed clothed male clothing domimant domimant male duo fellatio fire elemental grillby grillby (undertale) hand on another's head hand on head head grab heart-shaped pupils heart eyes hisuivirus hooded jacket hoodie irrumatio jacket larger male larger penetrating larger penetrating smaller line art lineart male male/male male only male penetrated male penetrating male penetrating male maledom malesub monster oral penetration penis penis in mouth sans sans (undertale) seme grillby sex simple background skeleton small sub small sub big dom smaller male smaller penetrated smaller sub smaller sub bigger dom submissive submissive male top grillby topwear uke sans undead undertale undertale (series) upper body video games white background yaoi