"It's really only 3cm at the tip..." A week of teasing creampie, a childhood friend who has met again for the first time in a long time, begins with a prank on her friend, and is less than an affair.

After a few years of marriage, his relationship with his wife has become cold and he is living separately. It seems that his childhood friend Yuu is the same, complaining each other over the phone. Then they decided to drink for the first time in a while, and invited Yu to his home. A few hours later, the alcohol gradually progressed, and the sexlessness caused me to be a disaster, and I was captivated by Yu's body and tried to push her down. He was stubbornly refused to cheat on him, but Yuu seems to be in the same way as his frustration, and if he had just 3cm... he started a relationship that was more than friends but less than extramarital affair...