Okay, next thing I can think of is that you clicked through the scene that actually triggers Kohaku's pregnancy and locked it out without realizing it, because the Yes option (placed right where the normal Next option goes) is what rejects that route, while picking No is what leads to her getting pregnant. It happens right after seeing any of her sex scenes so if you're clicking through them without paying close attention you could have missed it.
Crack open your save and see if you have a flag called KOHAKU_PREG_OFFER. If yes and it's not followed by a flag about her pregnancy timer, you skipped past the trigger and locked it out.
Crack open your save and see if you have a flag called KOHAKU_PREG_OFFER. If yes and it's not followed by a flag about her pregnancy timer, you skipped past the trigger and locked it out.
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