Xbooru - 2010s 2016 2d 2d (artwork) 3koma animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub bigger penetrating bigger penetrating smaller blue blush blue hoodie blue jacket blush book bottom sans brother brother/brother brother and brother brother penetrating brother brothers clothed comic comic panel comic sans digital media (artwork) english text fontcest from behind fully clothed gloves headphones heart-shaped pupils heart eyes holding book holding microphone holding object hooded jacket hoodie implied penetration implied sex implied vaginal incest jacket larger penetrating larger penetrating smaller male microphone mmmemmo mounting onomatopoeia orange background orange blush papyrus papyrus (undertale) papysans reading red gloves sans sans (undertale) seme papyrus simple background skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom solid color background text top papyrus uke sans undead undertale undertale (series) video games