Well, thank you for telling me. How would an asexual romance work, then?
What BabyFrattelli (love the username by the way, "baby brothers") is right.
An asexual romance would depend on the type of asexual. If it's a sexually aversive one, like me, they'd be into cuddling, maybe kissing and whatnot. Having the more common type of asexual, the ones that have active libidos, would be difficult. It would be hard to tell that they're asexual since they'll go with it (assuming they consent). Maybe if they take no pleasure in it, it would be easier to tell.
No that no matter how close an asexual is with a person, they will never experience sexual attraction to them. People who don't experience sexual attraction to people until they have formed a close, emotional relationship with them are called "demisexual".
I believe there are ways to make an asexual relationship in a game work, and it could actually make for some interesting story, in my opinion. Hero tries to woo them with their sex appeal, asexual person tells them it doesn't work like that. Later they form a romantic relationship, maybe have sex. They may not be sexually attracted to the PC, but the seemingly unbreakable wall ends up being passable.
Basically picture Isabela flirting with someone who is into women and getting no reaction. The horror she would feel. XD