(masterpiece), ultra-detailed, photorealistic, 8k, futanari, sitting on chair, legs spread wide, topless, large bare breasts exposed, nipples erect, wearing boxers pulled down to thighs, thick erect cock fully exposed and curving left, large balls resting on chair edge, blue pubic hair at base, one hand gripping shaft firmly, actively stroking, visible motion in fingers and wrist, semen spurting forcefully from glans, cum in mid-air, dripping onto thighs and hand, thick fluid trailing down shaft, cock glossy, veiny and wet, swollen tip, tense abs, thighs flexed, hips slightly thrust forward, mouth open in moan, eyes rolled back, flushed face, expression of orgasmic release, long sapphire blue hair with red highlights, blue eyes, sweat beads on skin background, warm dim bedroom, soft shadows on floor, chair facing viewer, messy bed and nightstand behind, erotic atmosphere