I'm currently mulling this one over. I am a non-biological mother to my 7-year-old DD who is wonderful. I tried for another one a couple of times when she was a baby, but it didn't happen, and my then-partner was pretty unsupportive, so nothing came of it. I've felt pretty sad about it, but (especially after my ex and I split up), I couldn't see how I could possibly manage, financially and logistically, to try for another baby - I'd need IVF, which of course doesn't come cheap, and though my job is very flexible, obviously babies and childcare are expensive.
Recently, I got into a conversation with a friend of mine - he's also gay and with a long-term partner - and he admitted he really regretted never having children, and encouraged me to go for it. It wasn't a conversation I think either of us expected (there is quite a big age gap between us, for starters), but we think we'd like to try together. He wants to provide financial support and we're both clear we'd need a solid legal arrangement, and based on the discussions we've had so far, I do feel comfortable that he has a decent idea of what financial support would need to look like. We also seem to be on the same page about how much contact we'd want to have with a child and with each other, and how his partner fits into all of this.
But my question is: has anyone co-parented with a friend, and how was it? Or do you know people who have? We both do know people in this situation - he knows more, and better - but I am turning it over in my mind. I'm especially thinking about my lovely DD. She has known him for years, and likes him; he is good with her. She has grown up well aware that I am not her biological mother, but that I am her real parent and I love her very much.