Prompt: (masterpiece), (best quality), 1boy, 1girl, hatsune miku, (sex, standing sex1.2), sex from behind, standing split, vaginal, huge breasts, nude, standing on one leg, thighhighs, blush, open mouth, (orgasm, ahegao:0.9), (heavy breathing:1.2),
Negative prompt: (worst quality, low quality:1.4),