((yennefer turned into a mermaid, monster girl, mermaid tail, full tail displayed, caudal fin)), with long hair and dark brown eyes, cinematic, prone, on back, on plain floor, wide-eyed expression of surprise, mid-transformation into a mermaid, exposed pussy, pussy, squirting, erect clitoris, seamless transition from torso to tail, her lower body is a shimmering, iridescent tail with intricate scale patterns, tapering tail, beautiful, mature, erotic, explicit, perfect face, thick lips, very flat chest, dark eyes, surprised, shocked, gasping, moaning, looking down, submissive female, seductive eyes, eyes half closed, small nose, round nose, large jaw, with scales covering her lower half, facing the viewer, eyes downcast, simple white background, line art, lighting on the subject, very wide shot, full body visible, magical atmosphere.