Friction might help speed things up...

"Hmmm... remember, Amanda, it warms up faster if you create friction, such as a repetitive thrusting motion... just to get it closer the base temperature of ninety-eight, of course" Mrs. Olivia offered as advice. Wait, did she say 'thrusting'?

Amanda took the cue, and began to pull out and push back in the solid glass tube rapidly, as my precum drip drip dripped into the tangle of pubic hair above her vagina. I was being ass-****, essentially. By a girl.

"Oh! OH! Ah! Oh! Oh! UH! OH!" I lent a helping hand by thrusting back. Pre-cum was going everywhere, seemingly in endless supply. Mrs. Olivia kept wiping it up and then absentmindedly consuming the excess moisture oozing down Amanda's inner thighs.

"Mmmm..." the nurse seemed lost in the apparent deliciousness of the flavor. "...You can probably stop now, honey, give the thing a check."

Amanda pulled out the thermometer, took a whiff, recoiled slightly and read off the temperature.

"99.3 degrees."

Mrs. Olivia noted the figure somewhere on the clipboard she held and sat down at her desk. Amanda shifted me around so that I was sitting up on her bare lap once more, wrapped her arms around my waist, let her knuckles lightly brush up against the tip of my cock. I tried to stand up, but I couldn't get leverage and she pulled me right back down again. What was her game, now?

"Um, okay... what next Mrs. Olivia?"