I made a big splash in the hearts of my peers, and I earned the support of the most intelligent adults in my life.
And I still got the girl.
Her parents are at worst a temporary obstacle that may in fact be overcome pretty early, relatively.
You can be a secret girl-lover or you can be an open girl-lover.
If you want to go about your business in peace and can reconcile with everyone else's retardation and almost inevitably end up losing the girl long-term, then yes, you should never come out.
I had more ambition.
Sure, some people stabbed me in the back, which I always expected (hope for the best but assume the worst), but I had enough support elsewhere to rapidly mitigate that (as I was always sure I did).
And if you want to change others' minds and convince them of the injustice that goes on, you go my route.
If it wasn't quasi-incest then this wouldn't even be an issue.
But SHE figured out where my feelings were coming from (as smart girls often do) and SHE wanted to make it a thing, and I reluctantly agreed after a lot of pressuring because hell, I can't say no to her after she saved me from my own hell more times than I can even count.
Personally, if she was smart enough to come to the conclusion on her own that I have a sexual attraction not just to her but to girls her age in general, and loves me enough that she gives no fucks except for my own emotional well-being, I trust her at 10 years old more than any "grown-up" who is willfully ignorant to save themselves from discomfort.
If I come out of this with my arm around the girl even if the parents feel betrayed, that's still a remarkable win.
Thanks for the luck.