masterpiece, best quality, 8k, ultra-detailed, razor-sharp focus, cinematic lighting, my little pony style, anthro pony, equine anatomy, 1girl, 1male, original characters, female unicorn with silver coat and flowing lavender mane, male earth pony with dark brown coat and black mane, both adult, standing on a grassy hill under a starry sky, female bent forward holding a tree trunk, rear view, extreme close-up on her plump round ass, male behind her, thick equine cock penetrating her wet pussy, his hooves gripping her hips, anal view with pussy spread and anus visible, female looking back with half-lidded eyes, deep blush, open mouth with drool, ahegao expression, male smirking with lustful eyes, background moonlit meadow with fireflies, cool blue and warm golden rim lighting, shallow depth of field, hyper-detailed anatomy including genitals, soft shadows, sparkling particles, super sexy