My wife's recently become quite skilled at sex; turns out she was seduced by the upstairs neighbor's penis! (Yui Hatano, NGOD-041)

My wife Yui and I have been married for 7 years. Recently, I've been losing my stamina during sex. But one day, I discovered that the young man upstairs was coming to my house and chatting and laughing with my wife. And ever since that day, my wife has become increasingly lewd during sex!