(masterpiece, best quality, highres, photorealistic), 18-year-old European girl named Yuna Sato, petite but hypercurvy, wide hips, extremely narrow waist, large soft natural breasts, pale blushing skin with subtle oil shine, long pastel-pink twin tails with ribbons, large glossy blue eyes, parted glossy lips, overwhelmed expression, sitting exhausted on the edge of a frilly pink bed in a pastel-lit bedroom with plush toys and fairy lights, wearing a torn magical girl cosplay, pastel choker, detached sleeves, pink thigh-high stockings, skirt pulled above her waist, upper body nude, both hands still gripping her thighs as she holds herself spread wide, legs lifted and parted, (anal gaping:1.4), (rim stretched into a deep, circular tunnel:1.3), (bulging outward and trembling:1.3), (skin taut and pale from strain:1.2), (inner anal walls glistening and fully exposed:1.2), unable to close after extreme overstimulation, fluids slowly trailing down from the center of the gape, lower abdomen lightly trembling, photorealistic anatomical precision, hyperdetailed folds, skin texture, light glimmer and hair, , , ,