Taken from the HS2 mod sharing Discord and it seems to work OK <- mod itself
Quoted directly from the discord (love to pixelgrinder

):
"[ddaa33] Pregnant plugin (ShapeKeyPlugin)
Since there's a lot of people who doesn't know this works in HS2 i'm reposting it.
Not an official port
Press left Ctrl + 0~4
(Numpad) to show the menu. 0 = the first character
You need to select [Female] z_ddaa33.belly as uncensor first For studio and main game.
Doesn't work well with clothes,
the config doesn't save to the card.
-Use mikke's beaver plugin to save the settings to the card
You must be registered to see the links
From ZODgame, all credits to
ddaa33"
ED for basic TLDR:
- Install mod
- Go to character maker
- Use z_ddaa33.belly as uncensor for your female
- Press CTRL+0 (numpad zero)
- use sliders
- ???
- profit
Regarding the saving and not working with clothes, it saved just fine to a card but clothes do NOT morph to the body shape at all.
Works just fine in HS2 from what I've tried