Years ago my first wife and I would end up separating for periods of time due to incompatibility, and I'd get an efficiency apartment for awhile. After a couple weeks or so she'd knock on my door after work and we'd fuck, then get back together. She worked night shift and me days. During one of our so called breaks from each other I'd met a friend of mine wife's sister who was divorced. We began seeing each other and my wife found out and there was nearly a cat fight. Afterwards, knowing the conflict between the two, I kept a low profile. Anyway as it worked out I was fucking the divorced sister gal every day at my apartment during lunch, then while she was at work during the evenings my wife was coming over and I'd fuck her too, right on the stained sheet from the other one, and so on, every day and night for over a month, and neither one found out about the other.