On my first night staying at my girlfriend's house, I was filled with anticipation, but an unexpected turn of events awaited. Her sister appeared, clad in provocative high-end lingerie, a sight so stimulating it was hard to look away. Her prominent G-cup bust and extreme underwear combined to blow away my rationality. The secret internal ejaculation sex, hidden from my girlfriend, was irresistibly thrilling with its sense of taboo. In the bathroom and bedroom, the tension of nearly being caught led to 17 explosive ejaculations, pushing excitement to the peak. Itsuka Miei's performance was stunning, with the lingerie's destructive power serving as the ultimate equipment for maximizing eroticism. Her 'Kui Kui Kuiiii' line is adorable and adds charm to the entire work. Fans of Miei will undoubtedly resonate with this catchphrase. The addition of reverse NTR elements made the unexpected plot utterly captivating.