Anal exam

"You silly!" she says with a giggle, "You were supposed to take my anal temperature. I think you missed!"

"Oh, I'm sorry," you say, "I suppose they should have taught us better in medical school."

She looks over her shoulder at you with a grin. "Are you going to take my temperature or what?"

You look her in the eye and raise an eyebrow. "You do realize I only have this one...er...instrument," you say while waggling your penis at her plump rear end.

She licks her lips. "Oh, I realize that all right. There's lubricant in that drawer next to you. Now just do your job, Doctor Doe." And with that she turns back to face the wall and wiggles her round bottom playfully at you.

You open the drawer and find the lubricant she referred to. Opening it up, you squeeze some onto your left hand. Making a fist, you then lube up the first three fingers of your right hand by pumping your left hand up and down on them. Then you slowly slide first one, and then two, and finally three fingers up into her pert asshole. She moans as you massage her rectum, and your penis feels like it's about to explode.

Finally, you can wait no longer. Pulling out your fingers, you grab both mounds of ass cheek and roughly pull them apart. "Yes! Do it!" she shouts, as you slowly press your manhood into the puckered hole. Deeper and deeper you push, until your hips are pressed up against her ass.

"Oh, Doctor, am I going to be alright? How hot am I?"

Suppressing a guffaw you say, "Oh, you're very hot, I'm afraid. Let me just adjust the thermometer a little, though, to be absolutely sure I'm getting a good reading." And with that, you begin to thrust in and out, first slowly, and then more and more quickly.

As your thrusting intensifies, you leave one hand on her ass cheek while reaching another one forward to cup one of her breasts. She grunts with every thrust, and sighs as you fondle her tit.

Part of you would like this to go on for a very long time. However, another very particular part of you feels like it can't take it much longer.