Like was said to you in the other thread, being attracted to someone else is not the problem. It's what you do with that attraction. Flirting is definitely not going in the right direction--and you don't flirt with your big brother! Well, maybe in some places in the south, but it's generally frowned upon elsewhere.
I've seen potential EAs turn out for the best where they did develop into more of a sibling-style relationship, but that happened because as soon as the strong attraction was recognized, firm boundaries were drawn and never crossed. It's always dangerous territory, though.
