A huge syringe is stuck in the ass、Thrust your butt up、Mass sweat

A huge syringe is stuck in the ass、Thrust your butt up、Mass sweat、female students、Torn clothes、Tiny underwear、String underwear、Massive tears、a large amount of spit、Limbs tied with ropes、bound breast、feces、defecating、Excretion of urine、Drink urine、large amount of urine、pleasant sensation、red blush、Dirty underground laboratory、Human experimentation、mad scientist、surgery、

(nsfw:1.5),(worst quality, low quality:1.4),disfugured, deformed, poorly drawn, low quality eyes, border, comic, lowres, bad anatomy, bad hands, text, error, missing fingers, extra digit, fewer digits, cropped, worst quality, low quality, normal quality, jpeg artifacts, signature, watermark, username, blurry, artist name, nsfw