This is something I was searching around for lately. It can be unbelievably exciting.

Probably my favourite so far: http://www.eraudica.com/e/eve/2018/Vanil...gnant-Wife

There are a couple of nice ones (and free) in this subreddit: https://www.reddit.com/r/gonewildaudio/, just search through. Lots of impregnation also. For example: https://soundgasm.net/u/lipstickandhairpins/Option-2

Any other tips?

Here's some more from a really talented voice artist, mostly breeding related though - https://www.reddit.com/user/RuthieRen/co...y_a_while/

One of the more recent ones - https://www.reddit.com/r/gonewildaudio/c...pregnancy/

prob long shot if people still look at this here is a little taste of my stuff i saved up https://cyberfile.me/shared/y8o-kgje42