Xbooru - 2020 2020s animal genitalia animal penis animated skeleton belly bulge big dom big dom small sub big penis bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller bottom sans brother brother/brother brother and brother brothers crying crying with eyes open diphallism drool duo ectobody ectopenis fontcest from behind gaster blaster genitals grabbing arms grabbing from behind hemipenes huge cock huge penis incest larger male larger penetrating larger penetrating smaller line art lineart male male out of frame male penetrating monster naked non-con non-consensual noncon nonconsensual nsfwgarbagedump papysans penetration penis prison guard position rape sans sans (undertale) seme papyrus sequence sequential sex size difference skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom solo focus tears top papyrus uke sans undead undertale undertale (series) unseen male face veiny penis white background yaoi