A little focus in communication.

And it works especially well in correspondence - in it we pay more attention to words. Use the word "we" more often. So you subconsciously attach to the girl the idea that you are together - this is not such a "strange" idea. That is, you need to say not "you definitely should meet with me," but "we definitely should meet." Or for example: "I think that we both like the deep house - it's a signal from above." Use "we" almost from the very beginning of communication, as soon as you create the proper degree of comfort.