The girl from high school Part 2

From my last post I said that we had been hanging out for the past 5 days. We cuddle together and talk, and sometimes wake up in the middle of the night together and talk a little.

This is my question. We talked about being really good friends/ FWB and that she would like it to be more. She says she wants to become more physiical and she shows it. But she holds her self back, and I don't know if it is really because she is on her period or it is because she really don't want to take it that far, I do know it took us almost an hour to fall asleep together, because how turned on we were. And I know how she is and I know she will want her free time and space, but this wed. I leave for three weeks for work. I know she is just like me in the fact that physical contact and sex means a lot. Now how in the world do I make this known, so we can do this before I leave. I don't think their really is anything I can do, but I thought I would ask and see if anyone has an opinion.