whoa.. this girl is bring you lunch? 
Um.. hate to say it .. but she sounds hooked already. Having sex with her will only confuse her. She wants you all right.. I willing to bet that she wants you as a relationship too.. 
If you want casual sex.. be honest.... ontherwise .. you got a stalker situation! 
Good luck!
				
			 
			
		 
			
				
			
			
				"Remember always, that you not only have the right to be an individual, you have an obligation to be one." 
 - - Eleanor Roosevelt
" It's not who we are that holds us back, it's who we think we're not." 
- - Michael Nolan
"...to love and lose, is better than not to love at all..." .... Lord, whats his name.... 
" The world is big... I want to see all of it before it gets dark." -- John Muir