Have You Earnt It?

You are looking for the business finance sheets and you want to know if Ivy has seen them, as she bends over her desk you notice that her skirt has a zip all the way up the back. The zip has opened just enough for you to get a peek at her ass cheeks and you get an instant boner, Ivy catches you looking at her ass and she is pleased to see the bulge in your trousers. Surprisingly she wants you to take it out and wank it for her while she bends over to tease you with her ass.