Another thing, about pregnancy, to make it fit in game, if Yurika gets pregnant, spy agency gives her experimental serum that speeds up gestation to 1-2(?) weeks and later takes child to be raised in their school.
But the drawback is that serum raises sensitivity and libido, and Yurika has to spend this time in such state on her side-jobs.
What jobs it can be? Nursing centre where she milked to feed kids (seeing how productive she is, nurses put her in industrial level milking machine), cafe where she sell iced latte with a breast milk, shadowing spy missions where she follows target since nobody will suspect a pregnant woman, porn studio filming hardcore pregnancy porn, laboratory where she's sent to study how serum affects libido.
Also the game has "monster" tag, how fantastic is it going to be? If tag is not the accident, game can has side-quest that unlocked if Yurika gets pregnant several times, she's tasked to help secret lab, only there she discovers that she was chosen for interspecies impregnation experiment cause of her fertility, and has to be bred by some monster.