Breeding using my brother

I'm a lesbian and I've a partner who really wanted to have a child. But we were shortly to marry, and she wanted any child we had to be both mine and hers. Which was hard as I don't have a penis, but I do have a younger brother who is really timid around women. Even me, but that has more to do with me teasing him growing up. He was in his last year of university and doing quite well. He stayed on campus and was called a geek or a nerd regularly. But I knew he wasn't gay as I've caught him before watching porn, no gay sites in his history. Liked to watch women getting fucked too scared to ask one out. First, I had to get him living with us and it was easy as he was being bullied by some jocks. So, I told him he could live with us for the rest of his time at the university and we would drop him off and pick him up as he didn't have any transport of his own. He got his own room in our house; we were paying it off. We decided to get him excited sexually by wearing very revealing clothes in the house or just panties and a bra. Plus see thru clothes with no underwear. I know it was affecting him as I saw a bungle in his pants a few times. But we didn't try to seduce him straight away, as my partner was mapping her cycles. We waited until her cycle matched a bungle in his pants and he went to his room, we gave him a couple of minutes to get started and then joined him in his room totally naked. He was totally shocked getting caught cock in hand, my partner straight asked him to fuck her, and I supported her and help convince my brother to accept. The first fuck was a bit awkward, but he improved with our help. After that he was putty in our hand as the saying goes, I was a bit jealous as my partner was getting regular servicing from both me and my brother. It took some time, but she got pregnant, and we had a baby girl. Now 5 years later my brother has career going fairly well and still lives with us, my wife still fucks him if we think he is thinking of moving to his own place. He still doesn't date and as a result of the fucks he gets from my wife we've have a son born June last year. Much to the joy of his sister now 5, my brother might never marry. But at least he will have had children, my wife doesn't have a close male relative. But I don't think I could let a man fuck me even if it would give a baby.