So I've been married to my wife for 13 years. My wife has been married to her 2nd husband Mike for 6 years. She had been cheating on me with Mike for about 2 years before they got married. She ended up getting pregnant by him. Instead of her wanting a divorce, she said she wanted to marry him but stay married to me. He makes double what I make. We all live together. She and I have sex about once a week. Sometimes twice a week. In ok with that because I have sex with another man a few times a week (she doesn't know).
I like the set up. He pays for half and I pay half. They don't typically have sex or fool around in front of me on purpose but sometimes it happens. It's kinda hot to see her fuck him.