A muscular trainer's busty aunt, after seeking advice about premature ejaculation, was controlled by masturbation commands, resulting in increased erectile function and forceful ejaculation during sex. (Miyuki Yuna LULU-290)

To find a job, I decided to stay at my aunt's house in Tokyo for a few days. My aunt, whom I hadn't seen in a long time, was a muscle trainer with a fantastic physique. I consulted my reliable aunt about my premature ejaculation problem, and thus began my [JOI] training. I was instructed on masturbation speed, frequency, ejaculation time, and whether or not to allow ejaculation. During the penis training, my erection strength increased, and I couldn't control my sexual desire, leading to an incredible sexual encounter with my aunt!