Oh poor Adult Yona. Captured by the Iron Legion and given such a devious sort of torment upon her. <3
 
This is a personal idea that popped into my head. And here’s a fun short story to accompany it, Written and edited by Arcadias and Extor:
 

 
It was still to be several months before the Iron Legion even considered setting out upon the larger world, Grimsone and Obsidian still worked together in father-daughter unison to create the very foundation that enabled the movement to grow and prosper like it did – information gathering. Without Obsidian’s genius (and depravity) the Legion itself may never have been more than a handful of disgruntled earth ponies leading an ill-fated political coup.
 
However, back when it all began, Obsidian knew full well it was going to take a lot more trial and error before any of her techniques had the capability of reaching Grimstone’s lofty goals. Breaking a Princess. Even with all the resources and time in the world, theory was simply theory. No, that would never cut it.
 
Obsidian’s request to her father was simple – for him to use his spies to snatch a group of distinct individuals for testing and training purposes. Not only did she have tools to test, but sadistic students to train as well. Perhaps some of the Legion’s upper caste was initially put off by (mostly) uninvolved parties being brought into play, but for Grimstone, it was all a means to an end, and the region was rife with naïve, wandering types ready to be plucked away into an unforseen nightmare.
 
Ultimately however, the chosen set of victims were not just a highly unfortunate random group of nobodies. Instead, the fates had delivered the perfect prey. An assorted group of species which also had potential knowledge of the Equestrian Royals due to their connection with Twilight Sparkle, once Celestia’s prized pupil, now a Princess in her own right – and as such, the right hand mare to the Iron Legion’s enemy number one. Needless to say both Obsidian and Grimstone were immensely pleased, as the party of freshfaced adventurers offered both intel and a diverse testing litmus.
 
A hippogriff, a dragon, a changeling, a griffon, a yak, and an earth pony. Certain Legion members grumbled over the idea of placing an earth pony of all things under any form of duress without very good reason, considering it to be an ironic corruption of what they stood for, but for the sake of having a complete set, Obsidian insisted, have no balms about such things in comparison.
 
As such, agents were fast put to use to snatch away each individual, one by one.
 
Smolder was the first to fall, easily goaded into a physical confrontation of which the odds were utterly stacked against her. Her fate was a simple one. Dragons were well known for their strength and durability, and the Legion had no shortage of interrogation tools that required a sturdier test subject to use upon before their application upon thinner skinned victims.
 
Softening oils and lotions were used egregiously, in combination with heavy metal pinwheels, scratchers and pokers, to push the dragon’s soles to the limits of their tolerance. Every day, new trainees were unleashed about her bare feet, to take part in one of Obsidian’s favourite newly invented games – Break The Dragon. Needless to say, with hours on everyone’s hands, everyone succeeded eventually, though a particularly enterprising soul or two managed to get to her to the begging and crying stage within the span of a single hour, and were quickly considered Obsidian’s prize pupils, with a young stallion by the name of Onyx clocking in the record at a mere 36 minutes and 45 seconds.
 
When all was said and done however, the dragon had outserved her usefulness as a guinea pig (even if she still performed wonders as a trainee victim and would remain as such), and it was time for the Legion to acquire the next victim – Yona the Yak.
 
Similarly to Smolder, this girl was to be a tougher one, but as fur and skin was not quite as strong as scale, a different approach had to be pursued, tough or not. Obsidian pondered for hours on end, wondering what possible niche such a victim could fulfil, until the thought struck her.
 
For years, in her spare time, the darkly unicorn would pour through spellbook after spellbook, always on the hunt for the existence of a rumoured spell that would increase a victims susceptibility to gargalesis. Sadly, any such spell had been lost to the tides of time, and only a mockery of it remained. It had a similar effect and application, simply draw the runic letters on your victim with a runebrush, and their sensitivity would increase with every application.  
Difference being, this particular spell increased the victim’s sexual sensitivity, linking the effected body part squarely to their sex.
 
Perhaps pleasure defeated the purpose of torture. Her father would be none too happy if he heard she’d been making her victims orgasm all day to no real end. But, in its own way, an overabundance of pleasure was its own torment, and maybe the spell was worth investigating, even if it was mostly used by kinky lovers looking to spice up their sex life.
 
With such an idea in mind, it wasn’t long before Yona was brought to the unicorn herself, and having heard what sort of fate befell Smolder, was quick to deny any chance that she’d be pushed into giving up the location of her companions, or anything else for that matter.
 
Obsidian simply cackled, telling her that her own torture would not pan out quite the same way.  
With the Yak bound down on her belly, legs stretched out behind her and soles upturned and stuck fast through ankle and toe bindings, it wasn’t before long that the strong girl’s courage began to crumble away.
 
Naturally, the runebrushes tickled quite madly, which to Obsidian, was the best part of their effect, and Yona herself was quickly reduced to a giggling mess. Not quite the draconic howls of Smolder, but still a rewarding symphony in its own right.
 
The in and out process of drawing and redrawing the runic symbols continued for a long week before it became readily apparent poor Yona’s mind was being melted under a barrage of tickling and orgasms. Every trace, jot and scrape of the pen threatened to unleash one climax after another, to the point where getting intel from this girl was growing more and more unlikely. As it turned out, a victim could only take so many days of relentless orgasms before their mind turned to jelly. At least with blatant tickle torture, the victim had a greater yearning to do anything they could to avoid their treatment.
 
Smolder was serving as quite the little source of information even to the day, whereas Yona was reduced to a slushy mess. Perhaps Grimstone would have been unhappy with his daughter’s progress, but, like any good researcher, Obsidian decided to see the experiment out, to discover if the runes, if etched enough times, would become a permanent fixture. Even if the day came these victims escaped, Yona would be left with a permanent reminder of her time inside captivity. Every step she’d take would make her spine shudder with pure arousal, threatening to tip into an orgasm. Life would certainly be a trickier affair, and every walk would be its own experience.
 
That and, she at least had her curiosity sated. Yak feet were ticklish. But time was passing fast, and she had torture methods to design and test. Placing the second-best dragon breaker student, one Amber Rose, on Yona to continue her work, Obsidian set out to choose her next victims, knowing full well she had ground to cover.
 
There was a prominent rumor that any creature with wings had far more sensitive feet than their wingless kin. Any poor pegasi that ended up in her clutches were surely doomed to suffer quite excruciatingly, but for now, attention was turned to two other members of the posse. Gallus and Silverstream. Each sporting their own set of wings, Obsidian already knew full well these two would serve their use nicely. That this time she’d push for only the most raw gargalesis, and that there was to be no more playing around.
 
In her mind, she repeated the same phrase to herself time and time again. Birdies will be broken.