She's right, but you can't show that you're fallible

You feel ashamed of yourself. You put the girls in an unwinnable situation and whilst you truly believe that training to withhold orgasms and give oral pleasure to other women is for their benefit, you know that you ought to have given them sufficient warning to be able to prepare for the test. You resolve to be much more careful from now on and be more lenient when a girl fails because you haven't explained what's expected in advance. However, it doesn't help in this situation, as you already promised a harsh punishment and it wouldn't do to be seen to go back on your word.

"You mentioned that only men receive tips, but what forms may those tips take?"

"Er, money or services, like running errands or…sex."

"Sex with whom?"

"Well, with the man—oh! With anyone the man chooses." Realization dawns on the young student.

"And whilst I'm sure you're correct that Lorelei won't require any additional motivation to improve her skills, it's a fundamental principle of education that young women will only develop into well rounded adults through strict and relentless corporal punishment. That's why I must chasten Lorelei to the fullest extent. Anything less would neglecting my responsibilities. I hope you understand."

"Yes, Professor. I'm sorry for questioning your wisdom. Please don't punish Lorelei for my mistake."

"Of course I won't, Johanna. It's good that you can broach your concerns with me in a constructive manner. However, it's not your place to intervene on another student's behalf; Lorelei is perfectly capable of speaking up for herself and we could have saved time by having our discussion whilst I was flaying her breasts raw. Therefore, I've decided that you can join Lorelei in her three day nudity punishment after all."

Johanna thanks you forlornly as you take aim once more at her friend's exposed tits and lay the first stripe of fiery agony across the tender pink aureoles, just below where her nipples jut outwards.

Her whole body stiffens, mouth open in a silent scream as a red ridge appears right over both globes, the tip of the flexible cane having wrapped round the side furthest from you. It takes a moment for her to recover enough to thank you and ask for the next, her voice already breaking in anguish.

The next three blows land in the same region, by which time her responses are barely-intelligible croaks and her boobs are trembling so much that you couldn't guarantee hitting her nips again if you wanted to. Instead, you widen the target area, cruelly scourging the sensitive undersides with stroke after stroke. One benefit of their prodigious size is that they can take a dozen lashes from the slender rod without overlapping. You notice that the extra speed with which the end of the cane is travelling is causing the greatest trauma and walk casually around the completely hysterical girl, her green eyes wide and glassy with panic, so that you can inspect the crescent of blackening weals forming on the far side of her breasts. Just in time, you think, as you're sure that many more would have broken the parchment-thin skin.

In order to even up the welts, you begin to flog back in the other direction, causing an unrelenting crescendo of torment that leaves the teenager thrashing her head from side to side in a vain attempt to cope with the monstrous pain. You have no intention of awarding extra strokes for this, because although the cane you chose was deliberately light, two dozen blows to such a **** target is still a formidable punishment.

You return the wicked instrument to the rack whilst Lorelei struggles to regain control of her tortured body, boobs striped from side to side with a mass of livid corrugations that you're sure will act as a warning to all young ladies who see them. Johanna seems particularly affected, staring at the well-flogged globes with a mixture of sympathy and fascination.

"Johanna, when Lorelei's ready, could you help her put on some sun screen while I write up your placard?"

"Oh, yes, Professor, as soon as possible. And perhaps she could help me, because I burn almost as quickly as she does?"

"Good idea."

It only takes a moment to fill out the placard, but some time longer for Johanna to coax her weepy colleague off the table and onto her feet. You sit back to watch two naked beauties taking turns to rub sun screen into each other's skin, with much gasping and yelping to attest to how sore a lot of that skin currently is. Yesterday, this would have been a performance that would have filled your imagination for months, but amazingly it's actually one of the less exciting experiences of the afternoon! As you look on, you think there's something not quite right and ponder whether to add another restriction to the punishment.