[Honesty is the best policy ... Even when it does lead one to incredibly weird truths. Nariko lets herself process that information so that she doesn't immediately jump to her first, initial reaction: Which would be something akin to embarrassed horror. He's known this whole time! Granted, it's not his fault or even a skill that he may have honed or whatever. Something occurs to her:]
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Wait, so, can you tell when I'm ovulating?
[After all, that's a part of it!]