We had been married for five years when Bren, my wife, rather nervously asked me what I thought about her friend Cath. Cath is the same age as us and was going through a divorce. Bren was spending quite a lot of time with her friend supporting her.
I had always found Cath attractive but never thought of her as more than a friend's wife. I said I found Cath attractive but never thought of her sexually. I then asked what had prompted her question. Again she looked nervous before answering.
"She asked me if I had ever been bi-curious. I didn't answer until she added that she wanted to take the opportunity while unattached to experiment and I was top of her wish list. I thought she was joking but she assured me she was deadly serious."
"What did you say?"
"I was panicked and said I would have to talk to you about it. She came back and said that you would be very welcome to join us. She was bi-curious not gay and she had always found you very sexy."
I could tell she was not teasing me. I was not sure whether she was considering the idea seriously. Looking at her face I quickly realized that not only serious about the proposition but she was extremely aroused by it. She crossed the room to where I was sitting knelt down and removed my trousers and underwear in one go. I was aroused by the conversation but not fully erect. It took her much less than a minute to remedy that. As soon as I was erect she stood up reached under her dress and pulled her knickers off. Pulling her dress just high enough she straddled me and quickly guided my cock into her pussy. Normally she needs lots of foreplay and lube before she is able to receive me comfortably. On this occasion it was not necessary. She rode me with determination and urgency exploding within a couple of minutes with a roar of animal sexuality.
"I am so sorry but I needed that so badly. Now let me return the favor."
She quickly removed her dress and knelt down with her bottom in the air.
"Just take me and use me. Do not worry about me."
I did exactly as she said fucking her hard, deep and fast. We never fucked like this. As I got close to cumming she found her clit with her hand and she came as I enjoyed a violent but brief orgasm.