Looking for a story with an all female collective adversary

[Tri3Ax]

Asking for some help identifying a story I read between 20 and 25 years ago (so around Y2K). It could have been as late as 2007. But that's the era.

The main elements that I remember are that it featured a post-fall setting, where an all female, Borg-like race had taken over. They would attack settlements and brainwash the women to join them, and feminize and brainwash the men too. Converted males were the ones given birthing duties. Feminize as in full gender swap, not emasculation/sissification.

The main character had a companion that came from a race/tribe that was androgynous until adulthood, and chooses their gender.

The main character spent some time captured by the enemy as they tried to break him. They weren't succesfull, and he either escaped or was saved by the companion. At the end of it, he's still male, and the companion chooses to be female to be with him.

Not sure how much it counts as a transgender story, but it certainly had the themes. It was more of a mind control story. Been trying to find it a while and hoping somebody has an idea or clue to help me.

Much appreciated.

[Eido]

What story sites have you checked? I remember a number of sites. TG is/was pretty popular and well organized. I don't know how many are still active though, but I can look if you haven't already.
Eido

[Tri3Ax]

I've hit stories online, bigcloset, nifty, transformation story archive, fictionmania.  I found an old asstr archive from 2007 or so and wasn't able to turn it up.  I also checked sapphires for 2001 to about 2007.

I'm suspicious that it's not from a big aggregator but that I was walking a mind control or transformation webring a while back and it was on a personal page.