At first I misread this as what if your daughteru was your waifu… eugh, no thank you. I know that there are people who like one or both of my kids romantically, and… it's kind of a weird feeling because while I appreciate that others care about them, I think they are both too young and not emotionally developed enough to handle a relationship or sex. And that's outside of my personal ethics about age difference. I'm not sure how serious any of them are, though; it's very likely that most of them are in it for the flavor of the month fap material.
To answer your question, probably not. If I met Keisuke when he was a kid, I would probably think he was a good kid and try to do my best to protect him… but it's a really different feeling when you have a kid. It's hard to describe. I would love to spoil him with headpats, though~ I would like to think that I have a solid enough head and moral structure that I'd be able to keep my cool if he had hypothetically confessed to me when he was a young/mid teenager, and I'd laugh it off if it was any younger. I don't want to date anyone significantly younger than me or have a huge power imbalance. I've seen that go wrong too many times despite best intentions.
I don't want to change history and intervene when he was a child, though, if that's what you're getting at. Even though it sucks, he needed that crappy childhood to become the man I love today.
Basically this >>53356
>>53360
Not against the rules as far as I know.