My girlfriend's younger sister controlled my ejaculation for 30 consecutive days. (Shiina Sora WANZ-745)

I ran into my girlfriend's younger sister, Shiina Sora, at her house! Suddenly, she grabbed my testicles and laid down three rules: 1. No sex with her sister; 2. No masturbation when she's not around; 3. This is a secret between the two of us! A genius at ejaculation control will whisper lewd things in your ear and keep your penis under control for 30 days straight!