There is no big need for inflated stomach. Girls can just tell MC that they do BC/stopped it/danger day today/got preg/beg to be bred etc.
The only possible way preg content can fit this game is to be emplemented in some ending/after-story.
Like it was done in
LabRats
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upd girls in game lack outer-sex interactions: in their core they are all same paper doll with same reactions and interactions.
Why people asking for preg content?? Cuz' it may make game (or girls) feel more "alive" and beliveable.
But hey, why not add another buggy paper-doll???? It's exactly the thing people want, RIGHT??????