I´ve just started playing this game, so far seeing lots of hot looking girls in a lot of different styles and hot outfits, including some sexy animations, so I can see the effort put in this game. So when I found this pantyless chick in class 5 with the Breed-Me shirt, I hoped to get some of that too, since i´t wasn´t tagged as such... now I´m reading here it won´t be, since it would need much more work, maybe even cross the story...
So I thought a bit, and came to following suggestion:
To minimize the extra workload, why not keep the sandbox appearance of pregnancy to girls with enaugh love or sluttyness or breeding-fetish to dirty talk to the mc while sex/ flirting while adding events for them telling the mc he filled their bellies, maybe showing him the positive tests, after which altering the sex-talk to things like I´m so horny being preggo, Try to get those other eggs too, or other stuff, while for the next 3 to 6 month there is´nt any visual change at the girls models.
Beyond that, when a visual change would be to expected, the crazy med-tech which is already implemented could offer a few options:
-halt pregnancy progress to let them keep those sexy shapes, allowing to go on
-greatly speeding up the progress, limiting the workload to a few preggo pics per girl, while the treatment itself limits acces to said girls, so allowing limited scenes in this stait, giving the dev full control over what scenes to dedicate to this
-Babys born through this do´nt even need to stay at the island, a mandatory childcare via some sort of foundation, foster parents or the like would explain that
-since we talk about options, the game as a whole seems to full harem mode, which I wont complain about. But adding options to branch of lovey routes for lone girls or story compatible groups might add ways to show the preggo stuff wanted, while keeping the main story on the course planned
I get that even those solutions would require quite a lot new pictures since there are lots of girls, but adding them in portions doable while working on alrady planned stuff should be possible.
And the scene descriptions and talking, if not being your cup of tea, might even be open to let those interested send you fleshed out scenes after getting images to work with (some development threat asking for help....)
Thus far from me, and godspeed to our dear dev