Second-hand bookstore's lewd wife

In a downtown shopping district...in a not-so-flashy corner of the city, there's a used bookstore that I frequent. There was a woman always reading a book in the back of the store. That's right, it's Mr. Leon, the store owner. He's the person I admire. I used to go to that used bookstore every day to see her. But one day, I saw Leon getting intimate with a middle-aged man. The man seemed to be a novelist, and I started having lewd fantasies about the two of them. But that could be an opportunity to experience a sensual world...