Extra-credit work will save her grades

"Really? Should I have gotten a better mark on the test?" Tia asked hopefully, playing with one pig-tail in a way that she knew any hot-blooded straight male would find enticing.

The professor smiled, even more-so as he watched her blatantly try to manipulate him. He'd met many girls like her over the years, and the prettier they were the more they were certain they could manipulate him just through their flirting. But he'd learned long ago to spot the ones to resist, the ones to demand more from, and the ones who were trouble. In fact he took a perverse delight in turning the tables on them, and if he wasn't misreading things this girl was prime material for that.

"Oh no, your score is absolutely accurate. You did horribly on this test," he ruthlessly told her, drawing a shocked look from her while his assistant looked surprised at his bluntness. "I do, however, see a solution to your problem."

"Oh. Really?" she summoned a weak smile, struggling to get back into character.

"Yes. I can't alter your marks," he told her sternly, forcing the expression to remain on his face in spite of her crestfallen expression, which he found so cute. "But I can assign you extra work."

The panicked look on her face very nearly had him laughing. His assistant had no such self-restraint, and snickered briefly before wiping his hand across his mouth.

"Extra... work? Oh, um, thanks but..."

"In fact, seeing how terrible you've done on this test reminds me of how awful your work in class has been," he lied, having no clue who she was, but delighting in how her expression became ever-more panicked as he talked.

"I think it's the only way I can keep you in my course. Otherwise I would have to simply save us all the bother by expelling you immediately."

"What? No, please, please don't," she pleaded. "I'll... I'll do anything!" she insisted, eyes wide at an attempt at innocence. His assistant's face lit up, but the professor had another plan in mind. Tempting as it was to simply take hold of this little slut and fuck her up against the wall he had a more interesting scenario in mind.

"Oh I'm so glad to hear that," he almost purred, full of mirth as she became ever-more comfortable and certain of what he would ask.

"I believe this extra-credit should be in a form that reflects the class-work. To that end, given the subject matter, I think you will..."