I think it is okay to be a little cocky in any stage. If you get compliments a lot (which you should ) then it isn't good to say "i know" everytime. But if the compliments are sporadic, then a little cockiness is okay in any stage. The reason I think it is ok is because most people associate that faux-cockiness witht he attraction stage like you said. Once people get into that relationship stage they tend to lost the flirtness that being cocky can bring. It just keeps everyone on their toes and brings back some of the feelings and interactions that couples have when they are first getting to know each other.

Exactly right, as the relationship becomes stronger you have to be playful without being a straight out ass. Basing your partners attraction on something which is false isn't going to go well later on, you must be consistent.

oh and Bonita, I like your use of the word faux. It gives me a mental image of David Tennants faux-hawk hair in doctor who crossed with the bird out of Harry Potter.

I like what was said about replying with the eyes and body language. I like to give a coy little smile then change conversation completely. you dont really want to get yourself into the situation where its like "no im not!" , "but yes you are" and then it can fizzle out and turn awkward. nor personally do i want to be too cocky about it even though im a strong advocator of cocky and funny. usually, if i caan.. il lead them to another part of the room after that comment.. or actually DO something... rather then answer it.

How about mixing them up?

"Are you flirting with me", then before she can answer say "No, seriously, thank you". Could probably get some kino in there too.