Even though I couldn't see any skin below her waist, I could make out her fingers working through the material of her pants. It wasn't all that hard to imagine what sorts of things she was doing and I was going to have to face the choice of either kicking her out or simply giving in. I wouldn't be able to hold out very long in the current circumstances.

After a moment of further hesitation I raised my hand to my erection and wrapped my fingers around it. It actually meant Kristin could see less of it, but her arm movements increased in intensity as soon as I started stroking...