Alone at last. My girlfriend had gone in to take her sleeping pill, and my stepson had gone in to pass out. So, it's just me and her sitting around the fire pit. I hadn't seen her since the concert, but we had done some sexting.  Seeing her climb out of their truck, when they first got here, in her maxi skirt and tank top, made my dick twitch. She was definitely the only birthday present I wanted to unwrap.  I had followe...