This is an unusual request, I am not asking for advice to get into a relationship or sex, I want to be friends with this person. Bear with me, please.

I met this girl today through mutual friends, I enjoyed talking to her, we didn't hit it off entirely, but we seemed to like each other's company, it was smooth most of the time. Later we went home, she lives in the same building I do, and it turned out she forgot her key and needed to wait for her room mate to come home. So, of course we went to my place and watched a movie. It went good.

As we were sitting there, watching the movie, I saw her eating popcorn and she seemed so comfortable there, and I really liked this image. In that moment it kinda hit me that I want to be friends with this person. I want this. Us sitting there, watching movies, having coffee or going for a walk, just hanging out, just having a nice time with each other. I really got a friend-crush, if that thing exists. I want her to call me when she sees something funny, and I want to text her when I think of a stupid joke. This is what I want.

I do have male and female friends, so this is not "new", but I never really made friends with an effort, I think. And whatever I think I could write her, seems so weird and sexual, when all I want to do is find out if she wants to be friends with me, and that's it.

What should I do? I just added her on Facebook and wrote something along the lines of "Duuude, add me back or I'm gonna go Bourne-style on you" (we watched Bourne in my apartment). She went to sleep before, so I haven't heard anything back. Give me advice please.