Masterpiece best quality, 28yo adult female with an hourglass figure and deep crimson lips, wearing the full gold-studded black leather bondage set. She is posed on all fours on a mirrored studio floor, her leather skirt pushed up to her waist to fully expose her posterior. She is inserting a massive, wide-based stainless steel anal plug, the metal mirroring the room. The prompt focuses on the, (anal sphincter explicitly stretched and gaping rim:1.3), the dark pink tissue of the rectum visible and open under the tension of the wide metal shaft. Her glutes are tensed and quivering, her gaze fixed on her own reflection in the mirror with a look of hungry submission. Cold, sterile lighting highlights the contrast between the polished steel and the black leather, 8k resolution, sharp focus on the anal opening.