Xbooru - 2020s 2021 2boys 2d 2d (artwork) anal animated skeleton big dom big dom small sub bigger dom bigger dom smaller sub bigger penetrating bigger penetrating smaller blue blush blue tongue blush bottom sans bottomless bottomless male brother brother/brother brother and brother brother penetrating brother brothers clothed clothes lift crying digital media (artwork) duo ectopenis ectoplasm ectotongue fontcest from front position goma dango 555 incest larger penetrating larger penetrating smaller making out male male only male penetrating mastery position monster orange blush orange penis orange tongue papyrus papyrus (undertale) papysans partially clothed partially colored penetration penetration from front penis pixiv id 49095896 riding riding penis sans sans (undertale) seme papyrus sex sex from front shirt lift simple background skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom socks socks on sweat tears tongue tongue out toony top papyrus uke sans undead undertale undertale (series) video games yaoi