You see Kim, obviously bored with the class

You see Kim leaning with her elbows on the desk and her hands under her chin looking totally bored. Her eyes wander the geography posters on the walls and you wonder what she is thinking about. You take a guarded look at her long athletic legs, clad in her tight fitting PE uniform. So many times you have found yourself staring at those long legs, many times you’ve gone home after school and wanked over Kim wrapping those legs around you, her lithe body pressed against yours.

You can feel your dick harden in your pants as you think about fucking Kim, and have to move a little to try to ease the increasing pressure on your hard-on. You squirm a little but it’s to no avail, the uncomfortable feeling of your hard-on grows. You glance over at Kim who is staring blankly at the desk and decide to risk dropping your hand to move your pants around your growing erection.

As cautiously as you can, you drop your hand into your lap and move your dick so it doesn’t press against the zipper of your pants, it’s outline fairly visible and as you slowly move to adjust yourself you notice that Kim is staring down at your pants, watching you as you adjust your dick.

What do you do?