Rias Gremory from Hig School DxD, nude from the bottom, (vagina), (shaved pussy), her hands are tied up with metal cuffs, (her legs are tied up as well), she is restrained, she is upside down on a futuristic dildo sex machine with a metallic rod, (face down), gag, (spiked metal dildo with a metallic rod in her vagina), her pussy is dripping, wet pussy, wide open pussy, (clitoris piercing, nipple piercing), dripping pussy, barcode on pubis, scorched huge brand on the ass, wounds, cuts, marks of blows, marks from a whip, burns, scars, bleeding, brand, bruises, contusions, gigantic empty laboratory chamber, (The gigantic empty laboratory chamber consists of big grey tiles), (very detailed big grey tiles in the background), (One-way glass window in the background), she is looking st viewer, masterpiece, very detailed image, 4k image