Keep at it until she accepts you win

Your hand released its hold on Dr. Nakamura's panties, and you felt the urge you'd experienced to help her humiliate herself fade. You took a step back, appraising her. There was nothing she could do to get out of her current predicament, you were pretty sure - well, except for not being a bitch anymore, but it didn't seem like that was something she was capable of. She glared back at you, but didn't say anything. At least she'd learned that much of her lesson, you thought.

You smirked, eyeing the marker all over her chest and the obvious still-spreading stain on her slacks, the obvious evidence of the urges you'd inflicted on her. Things were already going to be pretty bad for her from now on, but then she was the one who kept poking the bear, and it's not like you had anywhere to be - why not see just how far she was willing to take this?

"Alright, Professor," you said, your tone playful. "You're gonna make me pay, huh?"

Her lip curled, and she snarled, "That's right, you bastaaaaaaAA", and that was as far as she got as her hands shot up to grab her nipples. Getting a tight grip, she whipped her tits up and down a few times by her nips, and you gleefully watched them bounce as she squealed in pain.

You glanced over at the rest of the class, who was watching on in mingled confusion, concern, and arousal. This was more of an audience than you'd planned on for this little exhibition, but there was nothing for it now. Better make sure it didn't backfire on you. You raised your voice and addressed the whole class. "Hey, everybody, quick vote - As a group, would you rather sit quietly and watch until I tell you to leave, never telling anyone what's happened in this class, or forget everything you've seen so far and leave the room thinking class was cancelled today?"

They all looked around for a moment, and you had a quick panicked thought that maybe your powers wouldn't work on such a large group, but then they started murmuring votes, and you relaxed. After a second, everyone had voted, and then they all got quiet. It was sort of creepy, actually, having a whole room stare at you like that.

Apparently Nakamura thought so, too, as she flung an arm over her enormous tits and glared at the class. "Seriously, you're going to stay after all this? Pervs."

You turned back to her, your eyebrows going up. She really did refuse to learn, didn't she? You watched amusedly as she marched over to her desk and got out a pen, then with an awkward crane of her neck downward painstakingly wrote across her chest in big block letters; B - I - T- C- H.

She set the pen down, and then seemed to see what she'd done, and just stared for a moment. She made a hell of a picture, and you chuckled at it until her head whipped around and she glared daggers at you. You just looked back at her, questioningly. "Well? How about that payback?"

She hissed a breath out through her clenched teeth, obviously furious but not sure what she could actually do about it. You raised a hand to your ear mockingly, "Sorry, what was that? Having trouble thinking of a witty retort that isn't something bitchy enough you'll need to make up for it, huh?"

Nakamura just glared, and you grinned back at her. "I have to admit, you're certainly dedicated to your schtick. I wonder how far you're really willing to take it, though. Let's find out, shall we?"

You turned back to the class. "Hey all, would you rather answer any direct questions I ask you as best you can, or each write down something embarrassing you'd hate for me to do to you?"

Looking alarmed, the class pretty much immediately all responded they wanted to answer questions. Unsurprised, you smiled at them and took up a position at the center, like you were going to lead a lecture. Nakamura looked startled, and barked, "Hey, you can't just take arf!" She looked startled, then opened her mouth again and said, "Arf! Woof wuff arf!", sounding for all the world like a confused little dog.

Her face flushed with rage and embarrassment as you looked over your shoulder at her. "Sounds like you're starting to take the 'bitchy' thing seriously, Prof. Might want to sit down for a bit and cool off."

Obviously unsure at this newest development, she took your advice and sat down at her desk. You took note of her first act of relative humility with amusement; progress! Then you asked the class, "Alright everybody, let's get to work,. You don't need to know how, but by now you can tell I've got control over Doctor Nakamura here. The short version is, I'm going to teach her a lesson about the perils of being a bitch a few too many times, and you all get to help! She's probably been worse to me than any of you, but I know she's been generally terrible, so some of you have to have had a few fantasies about what you'd like to do back to her. Well, now's your chance."

Nakamura had been looking steadily more alarmed during your little speech, and she said, "Hold on a second - " But you cut her off, holding up a hand. "Nope, sorry teach, I think we've heard enough from you for now. Would you rather only be able to bark until I say you can speak again, or get a new tongue piercing every time you try to speak?"

She stared back at you, still obviously concerned, but after a second, in a very quiet voice, yipped once.

You chuckled darkly and gestured to the class. "Okay then, people, let's do this. Who's got something they'd like to see done to the bitchiest professor on campus?"

There was a brief pause, but then, around the room, hands started to go up. Grinning a Cheshire grin, you looked around at your classmates, scanning for the best person to start this off.