We have been married for 8 years now. Since the second year, wanting to have children, I have been having sex with my wife almost every day. But before we could have a child, I grew tired of her body. It has now been a few years since we last had sex. One day, Amatsuka moved into the apartment next to ours. From the very first glance, I was captivated by her beauty and cheerful personality. The next day, I saw Moe fumbling outside the door; it turned out she had forgotten her keys inside and was waiting for a locksmith to come help. Since there was a long wait, I invited Amatsuka to my house for a meal. After that, my wife and I, along with Amatsuka, drank and chatted. After a while, my wife went to take a shower, leaving just me and Amatsuka. I don't know if it was due to the wine, but I touched Amatsuka's hand, and she did not recoil. Taking advantage of the moment, I leaned in to kiss Amatsuka, but my wife came out, and we quickly returned to our previous positions. Though we hadn't done anything yet, both of us had silently acknowledged our feelings for each other. The next day, Amatsuka pulled me into her house. The two of us hugged and kissed for a while, and then I wanted to go further. But Amatsuka stopped me, she felt that having sex right next to my wife was very strange, so she wanted to wait for her to travel next month. During this month, I had to refrain from fucking my wife and masturbating, and Amatsuka would suffer the same as me. And a month of torture has also ended. As soon as my wife left the house, I went to Amatsuka's room. We couldn't wait any longer, but rushed at each other like two beasts, releasing all the sexual desire that had been accumulated for a month...