Xbooru - 2020s 2022 2boys 2d 2d (artwork) anal animated skeleton bedroom big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller blue blush blush bottom sans bottomless bottomless male brother brother/brother brother and brother brother penetrating brother brothers clothed digital media (artwork) duo fontcest from front position goma dango 555 incest indoors kissing kneeling larger male larger penetrating larger penetrating smaller male male only male penetrating monster on bed orange blush papyrus papyrus (undertale) papysans partially clothed penetration pixiv id 49095896 sans sans (undertale) seme papyrus sex skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom socks socks on tongue tongue out toony top papyrus uke sans undead undertale undertale (series) unseen male face video game character video games yaoi