Skylark does

Bethany continues to run her hands up the blonde teenager's sides to her armpits and then down the insides of her arms to the elbow, which is where surprisingly she finds the younger girl's weak spot. As soon as she dances her nails over her inner elbow, Skylark twitches and when her tormentor senses vulnerability, she pounces, attacking with all the maddening softness that makes tickling so difficult to bear. Before you can even admonish her to keep still, your helpless guest starts to struggle desperately, trying to simultaneously pull away and push your grad student off her. Unfortunately, she also stops pleasuring your arsehole, but at least that means you won't be too frustrated to punish her properly.

You stand up, signalling the end of the test. Bethany immediately stops tickling and instead pins the smaller girl down until she stops thrashing around, allowing herself a smile of satisfaction at finally managing to accomplish the task you set her of breaking the blonde's will. You look down at the slender teen and are delighted to see the despair in her eyes when she realizes she's failed you again and is doomed to suffer yet more intense chastisement.

It's convenient that you were using the spanking bench as a seat, because it doesn't take long for your grad student to secure your guest in place, on her back, arms fastened under the bench and legs pulled upwards and wide apart. You select a heavy birch bundle that you've been saving especially for this and prepare for the beating that you've been anticipating all morning.

"I'm sorry, sir," the blonde speaks without being prompted. "Please may I be punished for disobeying you."

You nod and bring the birch down across the middle of her left sole, the twigs spreading apart under the impact to leave a latticework of puce welts upon her tender flesh. Whilst you would love to make her hold position during the thrashing, she's clearly incapable of that level of control and struggles vainly against her bonds, screaming in agony. You wait for her to regain her composure and just when you're about to give her a repeat, she manages to gasp in enough breath to thank you and ask for the next.

You put this one at right angles to the last, going from heel to the ball of her foot. The response is even more animated, slim muscles bunching under delicate skin as she tries to protect herself from your merciless discipline. You walk slowly round the anguished young lady, striking her from all sides whenever she summons the strength to thank you and beg you to proceed. Heel, instep and arch all suffer your ministrations and when she takes too long to express her gratitude, you repeat the blow on the same spot. You only have to do that once and she becomes frantically eager to give her responses as quickly as possible.

It is already a fearsome punishment and you've only scourged one foot so far. By the time you've finished with the other and then worked your way down her legs to her hips, the pain must be quite unimaginable. You have no intention of stopping, however. Her abdomen and breasts make fine targets and you revel in the excruciating suffering you're able to inflict, but the most satisfying stage is yet to come.

Standing between Skylark's spread thighs, you rest the birch, only slightly fraying, upon her puffy and swollen pudenda, watching complete hysteria take hold when she comprehends just how much you're going to hurt her now. You raise the birch and whip it down viciously, torturing labia already so sensitive from previous punishments. Whatever she may have feared, the reality is clearly worse and for a moment you think you'll have an excuse to give her a repeat, but she desperately gabbles the required formula and then breaks down in helpless sobs once more at the prospect of yet more agony.

You angle the following blows to make sure that her anus and inner lips receive their share of the chastisement, viciously dragging the tips of the birch sideways to pull open her sex, both for the enjoyment such cruelty gives you directly and to make the prospect of pleasuring you all the more terrible.

On the subject of pleasuring you, after you mash the bundle into Skylark's welted twat with sickening **** one last time, eliciting a howl of nearly inhuman anguish, you hand Bethany the implement and step back to enjoy the teenager's tortured writhing until she manages to whimper out her thanks for the fiftieth stroke. You let her sob while Bethany frees her and when begs for the chance to show her gratitude for the punishment she so richly deserved, you know exactly what you want from the stunning girl.

Taking a firm grip of one delectable earlobe, you drag the elfin beauty up the stairs. From past experience, you know that reemerging into the real world from the dungeon of your cellar can cause psychological trauma as your trainees realize that their ordeal is not some nightmare to be pushed into the darkest recesses of their memory, but rather a taste of what their future holds if their behaviour falls short of the required standard. It's while Skylark is still processing this unwelcome fact that you lounge back on your sofa and order her to mount you and bring you to orgasm.

If anything, she starts to weep even harder as she straddles your hips and impales her excruciatingly sore cunt on your rampant cock. You're sure this is not a sign of discontent at the instruction to pleasure you, but rather an indication that she's scared of failing in her duties, as she should be, because a return to the cellar is always possible. Personally, you find the flowing tears both attractive and stimulating, but you acknowledge that others may feel differently and resolve to mention this to her when she's finished. Then, you're too preoccupied by the sensations in your pampered prick to think about much of anything else.