I asked this chick out for coffee, and she replies "why do you want to go with me?" I would like to bang her in the future. You guys say not to directly tell a girl that you like but I don't know what to do in this situation.
How do I respond so that I get my needs and wants meant while still keeping tension and mystery?

Edit: I said "lets go get coffee saturday at 1." She replied that she has practice. I ask when she was free (ignored the brad pitt rule because I thought I was getting a vibe). She replies "why do you want to go with me haha"