My girlfriend's reserved mother assists us in our intimacy

I've always been keen on my girlfriend's mother. I've been dying to get my hands on her. But my girlfriend, she's been keeping her mum all to herself. Until one day, when I walked in on them in the bedroom. Her mum caught me and she offered me a deal. She would let me fuck her daughter if I could satisfy both of them. I was taken aback, but intrigued. I agreed, and that was the start of a whole new world of pleasure. Every time I'm with my girlfriend, her mum joins in. She watches us, instructs us, tells us what to do. It's a whole new level of intimacy. And it's not just about the sex. It's about sharing, about giving in, about letting her mum be a part of our intimacy. It's a cuckold fantasy come true. And I wouldn't trade it for anything.