Yes, but only once

When the rod strikes, the resilient brunette lets out a pitiful yowl of anguish and hunches her shoulders instinctively to protect her sensitive boobs, but doesn't reach forward to cup them with her hands as a less determined girl might. She's actually impressing you with her fortitude, so you decide to give her another chance.

"Shoulders back, tits out," you order, sharply. "I will repeat that stroke and if you flinch again, I'll add another six."

"I-I can't, I can't do it," she sobs, shoulders heaving, on the brink of hyperventilating, so, putting the hand not holding the cane onto her shoulder, you look into her eyes and offer words of reassurance and encouragement.

"Shh, there, girl, it's alright. I would never ask you to do something you can't do and neither would your tutors. You're here because you deserve it and you need to believe in yourself. What we ask is difficult, but its for your own good."

You keep talking until she starts to regain control, then walk back to your starting position, ready to resume.

"Thank-you, Professor," she whispers, eventually. "Please may I receive the thirty-sixth stroke again."

You lash the cane down even harder this time, but the fit young student manages to hold still, despite the obvious pain, mouth open wide in a silent scream, until she draws breath and gabbles out her thanks.

The next couple of strokes go back to being only moderately hard, raising pretty weals on the upper slopes of her breasts, already drenched with tears, but by the time you flick a horizontal blow across her nipples for number thirty-nine, she's sobbing so vigorously that it's getting hard to aim. Accordingly, you decide it's time to change targets for the last nine and order Anthea to lie on the chair with her hips supported by the back and her head hanging off the seat. The obedient girl complies as quickly as she's able, considering how sore she is, then awaits further instructions.

"Now spread your legs wide."

Perhaps she expected this. Either way, she immediately does as required, achieving a full splits at a perfect height for beating, which is exactly what you do. Three strokes to her left inner thigh leave her weeping inconsolably. Three to her right make her retch from the excruciating pain. Three upon her plump pudenda send shockwaves through her inexperienced body, but still she thanks you earnestly for the thrashing you've given her, without once trying to avoid your blows. Perhaps your pep talk earlier is paying dividends.

"Well done, girl," you congratulate her, warmly. "You see, you can do it when you put your mind to it, just like your academic work. Apply that same focus in other areas and I'm sure you'll get through the rest of term with minimal further intervention."

"Thank-you, Professor," she mewls tremulously. "I'll do that." Then she starts weeping uncontrollably once more.

It takes about twenty minutes to get both girls sorted out, dressed, with dried eyes and somewhat poorer after tipping you generously. You opt for cash over sex, because you get so many opportunities to be pleasured by stunningly beautiful women nowadays that you usually prefer money. That's something you'd have believed impossible when you started using the Rulebook, but definitely not an unwelcome development.

When the students are ready to leave, you tell Anthea you'll see her next week (about which she seems surprisingly cheerful) and Lorna tomorrow (which starts the waterworks again). The pair of erstwhile strangers hobble out, supporting each other side by side and you reflect how fortunate you are that your new position as Junior Dean gives you the opportunity to exercise your penchant for severe spankings without being excessively harsh to the other young ladies you discipline.