Her mother was going to go camping with her boyfriend and had decided to leave us at home. While I was there, I took a shower, but got half of my bra ...et. Setting it over the side of the bathtub to dry, Katie gave me a loose fitting shirt to wear. It felt weird to be without a bra; I always had mine on, even when I slept. My breasts felt kind of heavy and exposed, and I began to wonder if Katie had looked. Apparently she had because she suggested we compare breast sizes.I agreed and pulled my. Pops' eyes followed hers and he said, "Go along girl. I'll be out shortly. I've got to take a piss."The girl did as her grandfather instructed. She headed for the door. Just as her hand touched the door handle, she heard a zipper unzip. She froze in place. She heard the sound of pee falling into the toilet bowl. Katie didn't open the door. Instead, she put her head against it to steady her nerves. She took several deep breaths. Her ears heard the peeing sound stop. Abruptly, she turn around and. "Hey stud ... my pussy is still leaking your cum from this afternoon" she whispered to me."Oh..." I stammered, not knowing what to say.Ginny continued "Do you know that tomorrow is Erin's 16th birthday?"Tomorrow was going to be in about 30 minutes as the semi-formal was winding up at midnight.She continued "Do you know what she wants most for her birthday?" Hmmm ... no ... I have no idea" was my response.Ginny moved her lips a little closer to my ear before she whispered "She wants to lose her. My cock was fully erect by now and was making a huge tent on the pants. This continued for some time when I noticed the time and decided to go to the restaurant for dinner. She agreed and we headed to a nearby hotel. In the lights of the restaurant I saw that she was really blushed and her cheeks looked like cherries. I mentioned this and she blushed further. We had a quick small dinner and headed back to the car. The rain had slowed down, but hardly any vehicles were seen on the road.I advised.