"Tom, I've thought you were very hot for some time, and your demands are more than fine with me, " Catharine said. "I need to learn about making love,...having sex and what turns men on and you're a perfect man to be my instructor, if you're willing," the sexy young teenager said."Catharine, you know I'm willing. I hadn't quite figured on being your firs sexual teacher, but that's a role I'll gladly take on with you. So, you're still a virgin, huh?? I must tell you that makes you even more. I decided that I wanted to get a closer look.I got closer to them and I could see his finger rubbing her pussy. She noticed me watching them and smiled at me. She then pushed him back and whispered in his ear. They started walking away and motioned me to follow them. We all walked into the restroom and into a bigger stall. They were all over each other as soon as the door closed. She pushed him against the wall and started undoing his pants. She pulled out his cock and it was over nine inches. "Um ... I thought you guys had gone down to the beach..." We did," she said merrily. "Without sunscreen I can't stay out too long, though. Where's Emily?"I wondered how long she'd been back. "She's taking a nap now." Wore her out, did you?" The knowing smile was a little incongruous on her broad, open face."I offered to drive!" I insisted. "But since it was her car, and she knew the way..." I trailed off. She was cocking an eyebrow skeptically."I think most of the damage was done rather more. Just when I felt the pain easing (numbing really), a wider intruder, possibly a second finger began its journey inside, and then a third. Each time I went through the near ripping experience, but kept my hands obediently on the wall and my ass pushed out in all glory. He showed his appreciation by slapping each cheek in turn, and doing a once over with my roughened breasts. Then suddenly, I heard a zipper and braced for the inevitable. It came slowly, as he pushed in a centimeter at a time..