Touch Me Like She Did

I'm a girl in my twenties. I have this hot memory with my ex-girlfriend, which I recently told to my boyfriend and he was really into it. It wasn't anything crazy, but it was still very exciting. We were lying in bed and she was holding me from behind, playing with me, and touching me ever so softly for what felt like an eternity. At some point she focused on my clit and stimulated it to a point where I lost all control of my body and eventually it made me squirt, I think, I'm not too sure, but it felt amazing. So my fantasy (and probably also my boyfriend's) would be to relive that memory with another girl, while he watches. And maybe at some point, if everybody's cool with it, he could also join.