Mr. Johnson wants you to be riding his Johnson

Mr. Johnson spreads out the folders on his desk and begins going over them with you. It's pretty boring but you notice the old man keeps checking you out in your short skirt and tight shirt. You take every opportunity to tease him a bit by uncrossing and then re-crossing your shapely legs.

"Would you mind getting me the Wicker file?" Mr. Johnson eventually asks.

As you strut over to the filing cabinet your high heels click on the hard floor. You find you have to bend forward at the waist to find the file Mr. Johnson is looking for. Your skirt is now just below your ass checks as you wish you had worn something more that a thong underneath.

Suddenly you feel Mr. Johnson standing right behind you.

"Mr. Johnson..." you begin to say completely taken by surprise as his hands reach for your hips. In the next moment you feel yourself being pulled back towards the balding old man. A hard object is now against the back of your skirt. You know it is his erect cock.

"Oh my!" you gasp.

What do you do?