Xbooru - 2020s 2023 animated skeleton arms behind back blue eyes bodily fluids bondage bottom sans bound arms bound wrists completely naked completely nude crying crying with eyes open edit edited egg vibrator english text fluids gagfan3 grey background hand hands behind back kneel kneeling monochrome monster naked nude onomatopoeia partially colored sans sans (undertale) sex toy simple background skeleton solid color background solo focus soul soul sex sweat taped mouth tears text thought bubble tied arms tied up tired but horny (artist) uke sans undead undertale undertale (series) unseen character vibrator