"Hmm, well let me think..." you ponder, the nurse still quaking on your shaft. "Well, where were you going to stick that thermometer you were looking for earlier hmm? Lets see if we can fit more than that?"
You see her eyes open wide in shock as she guesses what you mean. Then, with your shaft still buried in her sex, you force her head down, down, doubling her over. Luckily she is certainly flexible (probably comes with the territory in a vore school!) and you can soon feel her head pressing between her spread thighs and against your own rump.
"In you go. let me know what the accomodation's like in there!" and you heave on her head.