Been there.. "Wrong" and "weird" are very subjective categories, so it all depends on how you see it. Do they know? If so, how do they feel about it? In the end it comes down to just you two. If you both want it just go for it. And for sanity's sake you might want to decide whether to tell people who might not be ok with it.
Love is love, you can’t control it. You should just tell them how you feel, be very specific, if you’re the one that said you were ace, tell them that. Don’t worry about what others think, it’ll just bring you down. Without marrying cousins and such, the human race would be extinct, even today it’s common for people who aren’t related be genetically cousins and not know it and get married and such. Good luck with telling them!
I would say that these feelings are not wrong (nobody controls their emotions) but it’s definitely abnormal. Related people aren’t legally allowed to get married, because it’s easy for undesirable genetical mutations that cripple life forms to pop up.
The first thing you should do is talk to someone, which is exactly what you’re doing by posting this, good job.
I don’t know everything about this, so I’m going to wait until one of the server’s smarter members to see this and give you a more detailed answer.
Again, good on you for posting this, this is exactly what you should do if you’re confused.