Just wanted to share a thought that I had. Artificial wombs already exist. If any of the dolls were particularly interested in helping repopulate the human race, I imagine a game based in a future with space travel wouldn't have any problem accommodating them. As long as they could convince Aisha to shareAlmost all or all dolls will get pregnant. But in the enlarged belly there will be not a child inside, but reserves of nutrients for milk production.
If a portion of the work is being done to show them with bellies already, maybe adding a few dialogue branches would be easy?