Flip her over

You give her a few moments to catch her breath, her panting whimpers of pleasure steadying as she comes down from the aftershocks of her orgasm. Leaning down you growl into her ear again.

“Turn over, I want you to see Teacher’s face when I cum in your ass.”

“Oh fuck! Sir! Yes…” She gasps, still not recovered, but utterly unresisting as you pull out and push her more fully on top of your desk. You manhandle her smaller frame, turning her over and scattering papers and stationary across the floor. She lays back, legs spread on your desk, her face flushed, her eyes huge and hazy with pleasure, her tits heaving in the confines of her shirt as she pants. Between her legs her cock still juts up, her cum coating the head and her asshole twitching beneath it.

You press the head of your cock to her opening and with a long, satisfied groan, push into her once more, feeling the wonderful heat of her ass enveloping and squeezing you.