masterpiece, best quality, 8k, razor-sharp focus, macro photography, my little pony style, anthro pony, equine anatomy, 1girl, original character, Obsidian Rose, alicorn, jet-black coat with silver metallic sheen, flowing crimson and gold mane, glowing molten amber eyes, cutie mark of a black rose, adult mare aged 19, standing upright full body, rear view, looking back over shoulder with half-lidded eyes, deep blush, seductive smirk, large plump round ass, thick thighs, erect futa cock visible between her legs, wet pussy and tight anus also exposed, magical shadow tentacles from her horn wrapping around her body, background gothic throne room with candles and moonlight, cool purple and warm gold volumetric lighting, rim lights on glossy black fur, shallow depth of field, hyper-detailed anatomy including futa genitals, soft shadows