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 bottomwear brother brother/brother brother and brother brother penetrating brother brothers clothed clothed sex clothing digital media (artwork) duo ectopenis fontcest goma dango 555 holding hands incest interlocked fingers intertwined fingers japanese text kneeling larger penetrating larger penetrating smaller making out male male only male penetrating monster off shoulder orange blush pants pants around one leg papyrus papyrus (undertale) papysans partially clothed penetration penis pixiv id 49095896 sans sans (undertale) seme papyrus sex simple background skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom socks socks on text tongue tongue out toony top papyrus topwear uke sans undead undertale undertale (series) video games white background yaoi