A Hard Lesson: Disciplined By My Best Friend's Dad, The Professor - Taken by My Best Friend's Dad, #6

That's what you get for not behaving in class! Maria, an 18-year-old spoiled brat, thinks she can get away with anything in class - after all, Professor Alexander von Hohenstein is her best friend's father. He will surely give her a pass - at least, that's what she thinks! But Alexander, 38 years old, handsome, and working as a successful entrepreneur in addition to his job as a professor, is about to teach her a lesson she won't soon forget... When Maria goes too far one day, Alexander is furious and demands to talk to her in private - which Maria shamelessly exploits to blackmail him.
But Alexander is prepared for this. if Maria doesn't want to listen, she'll have to learn the hard way to respect her professor.  In this 6500 word-short story, a naughty student is disciplined by a handsome, intelligent, successful and well-endowed professor. And in the end, Professor von Hohenstein has a surprise in store for her - one that is as thick as a fist... This story is definitely not for the faint of heart.
But if you like it rough, this story will be right up your alley.