"On the 3rd, I had sex with my wife." My proud friend ejaculated 4 times each time, a total of 20 times, from me on the 5th, and slept with his wife. Shiraishi Marina JUR-573

"I haven't been with my wife as often lately, once a week is considered good now..." Shinji reunites with his college friend, Yuji. Yuji's wife, Marina, whom he married a few years ago, is not only beautiful and charming, but also sexually active, and he's proud to be told, "Marriage is wonderful." Shinji, with his excessive libido, feels regret. Then, he secretly visits Marina and forces himself on her. Marina resists Shinji's uncontrollable passion but also reaches orgasm, and after being penetrated five times a week, Marina finally feels dissatisfied with her husband...