Naughty, Naughty

I was at work a few days ago, sanding a job with Chris and Matt, for a pretty nice looking homeowner. Small, dark skinned, black hair, pretty smile... She gave me my first work related piece of ass. Yep. She came out of the kitchen, all smiley, and started talking about how one of her kids had just turned 18. I couldn't believe it, I'd have never guessed it. She asked if I wanted a slice of cake. I said sure. She opened the box in her hands, and in it was a cake in the shape of someone's denim clad backside....