Xbooru - 2boys 2d anal anal sex animated skeleton barista big dom big dom small sub bigger dom bigger dom smaller sub bigger male bigger penetrating bigger penetrating smaller black sclera blue blush blush bottom sans bottomless closed eyes digital media (artwork) duo ectopenis ectoplasm elemental creature elemental humanoid erect while penetrated erection fire elemental from behind position glasses grillby grillsans handjob handjob while penetrating humanoid kissing larger dom larger male larger penetrating larger penetrating smaller male male/male male only male penetrating monochrome monster monster boy penetration penis pink theme sans sans (undertale) sansby seme grillby shandrawaka simple background skeleton small sub small sub big dom smaller penetrated smaller sub smaller sub bigger dom t-shirt tears top grillby trembling uke sans undead undertale undertale (series) white background yaoi | 1028906

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