Xbooru - 2010s 2018 2boys animated skeleton bed bedroom big dom big dom small sub big penis bigger dom bigger dom smaller sub bigger penetrating bigger penetrating smaller blue blush blue pussy blush bookshelf bottom sans bottomless brother brother/brother brother and brother brothers doggy position doggy style position duo duplicate ectopenis ectopussy fontcest from behind from behind position gloves incest indoors larger penetrating larger penetrating smaller lower resolution duplicate male male only monster nsfwgarbagedump on bed one eye closed orange blush orange penis papyrus papyrus (undertale) papysans partially clothed penetration penetration from behind penis pussy red gloves sans sans (undertale) seme papyrus sex sex from behind sex on bed skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom top papyrus uke sans undead undertale undertale (series) yaoi