Sexual discount for Scottish babe

I had a new student today, a blonde doll named Amber Deen. As the Scottish lass got in the car, something about her seemed so familiar, but I'm a professional, so I launched into the lesson. Amber told me she had 10 lessons to her name, but she was a terrible driver! I booted her round arse from the driver's seat, and that's when it hit me! I had met Amber five years earlier in a nightclub in Edinburgh. We had shagged, and I...might not have called her back. Amber couldn't remember my face, and asked me if maybe it wasn't her twin sister? That explained things. Amber needed about 20 more lessons, but she didn't have the funds. She then told me I needed to give her a discount for fucking, then fucking over her sister! As a business man I couldn't, but as a warm-blooded male, when she flashed me her tits, I couldn't help myself. I fucked her tight pussy all over the Mean Orange Machine. Can you believe I've fucked two twins? What are the odds?