We've known of each other for a while, but kept actual interaction to a minimum.
She came over to cut my hair, got nervously flirtatious (playing with her legs, and feet...and constantly apologizing). She gave me a very sensual haircut, asked me for my opinion on her skimpy dress, and flashed me her "I'd hit that" booty shorts underneath, saying "Oh, and I just wanted to show you these".
My reaction should've been to instantly smack the shit out of her ass, but I was so taken aback that all I could muster was an, "...uhh....ha...that's cool". I think I just made her feel really awkward.
This girl intimidates me, and I really, really, really, really like that in a girl.

(more recent photo)
EDIT: Any advice would be greatly appreciated. Particularly from female members. I want to make her mine.