It had been about a year since Kasumi Yoshizawa had begun her “treatment”, and she couldn’t be happier about it.

She’d initially sought out advice from Dr. Maruki after a few bouts of uneasiness and anxiety troubling her for a few nights in a row. The gymnast had attributed it to her athletics – collegiate sports were on another level, after all! But… there was also some strange feeling welling up inside of her, l-like something wasn’t right! The type of feeling you have when you know you forgot something, but you don’t know what…

E-Even her dreams were getting strange. A voice calling out her name… seeing a face almost like hers…

Though she’d already gone to her senpai for advice – and technically Akechi-san, who happened to be with him, they couldn’t give her any definitive solutions. That was why she’d sought out a professional opinion, and Dr. Maruki seemed very concerned when she explained it all. He had referred her to a specialist who apparently had unorthodox methods, but a very high success rate with patients like her.

When the nurses at the “clinic” had presented her with a straitjacket and a padded cell, Kasumi probably would’ve freaked out if not for her counselor’s vote of confidence in the methods. They’d explained that a common, possible source of her stress was the abundance of choice present in the life of a young woman like her. Simply spending a few hours a week where she couldn’t choose: not having to worry about her homework, gymnastics, or, really, anything… might happen to prove productive. And it certainly didn’t mean she was insane, or had some kind of condition. It was just a slightly experimental treatment.

In the back of her mind, Kasumi was still a little hesitant, but there was little reason to not give it a chance, at the very least. She’d stripped down to her underwear and held her arms out in front of her acceptingly as the nurses fit the white canvas over her. They gently guided her arms around herself – through a small loop right on her stomach, so it looked as though she was hugging herself. All they had to do was tighten a few straps, including a particularly distracting one that ran through her crotch..!

And just like that, she was helpless. She shook her arms back and forth – easily held in place by the expertly tightened restraints, and once Kasumi confirmed to the nurses that she couldn’t escape, they left her to spend her hour alone.

It was… actually a little boring. Perhaps that wasn’t surprising in retrospect – padded rooms generally had very little to do – but it really was just an opportunity for Kasumi to clear her head. Locked away from the outside world, all her worries there seemed… insignificant.

She hadn’t even thought she’d been in there ten minutes when a nurse returned to free her. Kasumi was taken aback by how quickly time had passed, how… how easy it’d been to just let it all slip away. Quickly, she got dressed back up and left the clinic: walking a fair distance through a few loud… a-almost overwhelming streets, and fit herself into a cramped train to ride the rest of the way home.

Only a few days later, and she’d returned for another session – the night before a big gymnastics competition was to begin. Again, she was strapped into one of their straitjackets, left to her own devices, and given a full hour to rest her mind from all the mental stress that had been piling up.

When she’d won the competition – handily at that – she knew that whatever was happening in that cell, bound in that straitjacket… was working. Her visits were consistent: three times a week, as recommended, always during the evening, just so she could go to sleep with a fresh mind. Kasumi was quickly getting used to it as a part of her routine, and quite experienced with the whole ordeal. One time, she told the nurse that her straitjacket didn’t feel right – that it seemed a little loose, and she was right. The nurse tightened the loosened strap for her and told Kasumi that she could stay an extra half an hour as a reward…

That made her feel even better than usual.

But despite all that – she was still plagued by that nagging feeling inside of her mind. It was subdued, especially on the days she visited the clinic, but it persisted in her mind regardless. That wasn’t even to mention that on the days she didn’t visit, she felt a little… antsy? Laying in bed felt strangely uncomfortable, and she’d often try to replicate the treatment herself. Wrapping herself up in her sheets, struggling a little in them, going so far as to even buy a pair of handcuffs…

It just wasn’t the same, though. When she finally brought this up to the nurses, they scheduled an appointment with one of the specialists for her. The doctor asked her a ton of questions – about her life, her academics, her gymnastics, and so on. Anything and everything he deemed relevant, she spilled.

She was ecstatic to hear that they offered more advanced programs for patients who could benefit from them, and she was deemed as one of the lucky few who qualified. Eagerly agreeing to the terms the second she heard “daily, extended sessions”, Kasumi knew that this was exactly what she needed.

Entering her padded cell the next day, the woman was met with a surprise: a new straitjacket. This one was made out of sleek, black leather, and though Kasumi was apprehensive about the change, all of those worries melted away the second it was put on her. It was tighter around her skin, hugging every curve of her body firmly, not to mention how much more comfortable it felt! The cherry on top was the addition of locks: making her feel all the more secure in her bindings each time she heard that satisfying click. They truly made it impossible to escape, and that made her feel warm and safe.

Her time in the clinic from that point onward was truly wonderful. She could thrash against her bindings all she wanted, and nothing would change! Those hours flew by even quicker than the single hour before, and as great as that was… she didn’t leave the clinic with a smile as often. After all, it was the place where she didn’t have to worry about anything else. She could just be helpless. Be happy.

Kasumi had gotten a few adjustments to her treatment, after voicing those concerns and others. For example – when she mentioned that the anxiety of having to leave was beginning to seep into her mind and hurt the precious time she got in her cell, the doctor had added a few “distractions” to keep her mind away from such concerning topics. It began with a wand, manually taped in-between her thighs – this required her legs to be strictly bound to hold it in place, to which Kasumi quickly accepted – and it’d buzz away for the entire duration of her session. The pleasure felt… great, causing her mind to focus solely on it as she became adept at tugging her arms in a manner that tightened her crotch-strap harshly.

When she reported how successful that addition was, the doctor had given her a plug that she was to wear as much as possible, at all times. Only when one of the nurses had shown her where she was meant to wear it did she understand – a little humiliated and embarrassed about it, but still eager to accept. Walking around in public with the silicone device rubbing against the insides of her bottom was… to Kasumi’s surprise, more exhilarating than it was anxiety-inducing. There was a certain thrill to being able to rub her ass against her seat as she sat in lectures, giddy at the thought that no one else knew.

After a month of “training”, with consistently increasing sizes of plugs, she was finally presented with the reward for her efforts – which was a complete shock to the woman, given that she’d assumed that the plug was the reward. But the second those large, twin, rubber insertions were stuffed into her insides…

Bliss. Complete and utter bliss overwhelmed her, as she succumbed to uncontrollable pleasure over and over. Kasumi was completely helpless to stop it for a full three hours, and she’d repeat that fact over and over in her mind just because it made her feel even hotter in the head.

The second that session was over, she’d asked – no, begged, that it be a permanent part of her treatment. Her wishes were granted… so long as she agreed to wear a gag to help quiet her moans for the other patients. Three days into having a thick, red rubber ball stuffed between her lips and locked around her head with tight leather straps, and Kasumi wondered how she ever lived without it. She’d bought her own for personal use not long after – mostly for her time spent alone at home… a-and if she was feeling daring, hidden underneath a mask while she was out.

She was better than ever – so satisfied that she even recommended the clinic to her female friends… but still, her mind somehow focused on the tiniest of issues, no matter how much further she took it. The simplistic straps that bound her legs didn’t feel restraining enough, and after a request, she’d gotten it replaced with a tight, leather legbinder that matched her straitjacket better. Soon, she felt like she still had too much choice in the room. Which corner to lean in, whether to roll around and try to struggle… s-she needed it to be removed. She’d even delegated the choice of her gag and stuffing to one of the nurses – having bought a whole assortment of them to use on her. The stuffing was another matter entirely: Kasumi had handed over half a dozen choices of her own, old clothing… panties, socks, even thin stockings and gloves, along with normal rags and cloths for variety’s sake.

When all of these concerns, and more, were brought to the doctor, Kasumi was told that they had an… even more intense, and somewhat experimental method they could try. It would be ready for her in three days, and after this full year of treatment, she implicitly and completely trusted that it would be for the best.

The day arrived, and Kasumi was brought to a room at the back of the clinic. This one had no light at all in it – obviously no windows for natural lighting, but not even lights in its ceiling. Even the door to it was metal and heavy – grating against the floor as it was pulled open, ensuring that not a stray beam of light snuck in when it was closed.

Kasumi received the latest “model” of their straitjackets: and though they warned her that it was a little too small, such a promise only sold her on wearing it. The most notable additions were zippers around her chest – allowing either of her breasts to be let out of the leathery embrace, and the attachment of the toys directly to the straitjacket. Rubber slid into her insides and was only forced deeper by the crotch strap’s tightening, and there was even a small vibrator pressed up against her clit for maximum pleasure.

They laced up the legbinder, fitted her with her toys and even gave her as much stuffing as she could fit in her mouth. With the aid of flashlights, she was brought to the back of the room – where a padded chair awaited her. Sat down upon it, she was excited to see and feel the nurses strapping her to it. Lashing those leather bands tightly around her, she soon couldn’t even wiggle her legs or upper body an inch. A thick, heavy collar was locked around her neck, chained to the wall with no give – and they even tied her ponytail to the chains to completely minimize how much she could move her head. One final pair of additions took advantage of the fact that her chest was now easily accessible: unzipping the leather to tape a small, bullet vibrator to each of her nipples – the black tape taking an X-pattern – before zipping them back up to ensure they were as tightly pressured as possible.

This much was already promising enough. Then they explained the crux of it: complete sensory deprivation for her eyes and ears, in order to maximize the effects of her feeling, taste, and smell. She turned her head to the side in question – and the nurses correctly assumed that it was what she would gain from those latter two senses.

The reason why there were no lights in the ceiling was to make room for a tube-connected mask – the thick, plastic cylinder dangling all the way from up there. Bringing the mask over her mouth and nose, the nurses explained that the gas produced was… excellent at enhancing everything she loved about the sessions – and of course, was mixed with oxygen to still be breathable.

She waited in eager anticipation as her sight and hearing were taken away from her, one at a time. The thick leather blindfold was shut over her ruby eyes first – then all sound was taken away from her as a set of heavy, soundproof headphones were placed over her ears. She spent the next minute absolutely helpless. Had the nurses left her already? Nothing was happening – her toys hadn’t even activated! She struggled against her bonds for a moment… g-getting wetter by the second off of sheer anticipation…

Then it finally began. The gas began pouring down the tube, trickling into her mask as she received the first hints of it. The mixture was… sweet. A pleasant smell that she had no problem breathing in… and out… in… and out…

The effects were nigh immediate. Her body felt a little warmer all over. Sensitivity spiked – especially for her insides – where even shifting around slightly sent jolts of pleasure up her spine. And most importantly…

It felt so easy. All she had to worry about was breathing this sweet stuff in-and-out, and that wasn’t even a choice. That was simply something she had to do. So she did – and the calm washed over her as much as the sensitivity had.

Her toys switched on all at once, and the wave of pleasure crashed over her. She immediately began moaning into her gag loudly, her thighs squirming in receptive instinct helplessly as they thrashed against her bindings. None of them loosened one bit, so she tried harder – shaking her shoulders back and forth, pushing her body forward in an attempt to free herself from the binding of the straps, all the while the incredibly stimulating vibrators mercilessly buzzed away at her insides. Even turning her head back and forth didn’t loosen a single one of the devices on her head a bit.

She was completely and utterly powerless, and the second that thought crossed Kasumi’s mind, she climaxed immediately.

Every inch of her skin shuddered in pleasure. Even that sensation – her body rubbing up against the tight, restrictive leather, made her mind burn in excitement. Before she had even recovered from her first orgasm, she could feel another already beginning to build. W-Was this another effect of the gas? M-Making her body… t-this much more recep–

Her thoughts were interrupted by yet another frantic spasm of her body, as pleasure wholly overtook her once more. S-She… couldn’t even think straight… couldn’t even focus her mind on a-anything but…

The next orgasm. There was nothing to distract her from it – her excess of restraints ensured that. F-For a moment, she was even beginning to think that the gas was making her more… d-docile, for lack of a better word… m-making it impossible for her to think about anything but pleasure–

She forgot all about that when the vibrators kicked up a notch. Biting deep into her gag, she could do nothing but shake in pleasure. Embrace it. Fall into it. Sink deeper, and deeper, as she succumbed to it. Her body was preparing itself for yet another one–

Only for it to all stop suddenly. She whined in frustration – thighs squeezing themselves against one another to try and wring out the last drops of pleasure she needed, while the gas being poured directly to her face thinned out. A pair of hands pulled away her headphones, and took off her blindfold – causing her to wince at the light pouring into the room from a flashlight.

The doctor was before her, and told her that her three hours had already passed. She moaned into her gag – that was impossible! T-There was no way it’d only been that long! A-At least… she was pretty sure…

T-The memory of those orgasms was vivid b-but… maybe those were just the ones she remembered? Had she passed out, or..?

Confused as she was, the doctor had to repeat her name a few times to grab her attention. The effects of the gas still swirled around in her mind, and she meekly nodded – as best she could in her posture collar – as the doctor shone a light on a clipboard and some paper.

D-Documents..? Kasumi tried to listen to the explanation – prefacing it with the fact that the nurses could untie her if she wanted to sign them personally… or she could just nod in agreement to the terms, if she wanted to get straight back to her treatment.

Kasumi nodded eagerly.

Her mind, a little foggy and exhausted, didn’t quite catch every term that the doctor mentioned. Twenty-four… u-uhm, something… intensive care… relinquishing… “writes”?

It didn’t matter. Kasumi just nodded along, accepting everything that the doctor said. At the end of it all, the doctor leaned closely into her ear, whispering that she finally didn’t have to have any worries any longer.

She could stay locked away in this safe, secure room, and live in ignorant bliss as Kasumi Yoshizawa.

F-For a moment, some semblance of clarity returned to the patient. She wanted to ask what that meant – but the gag that she’d begged to be stuffed as heavily as possible prevented her words from even being heard as muffled moans. The nurses locked her blindfold back over Kasumi’s eyes – the woman struggling a little harder than usual as the earphones were put on next–

Then the vibrators began to buzz again. Her nostrils twitched – receptive to the gas that had begun to funnel itself back towards her. She took one, hesitant breath – immediately feeling a sense of relief washing over her. Kasumi took a second… then a third, as the pleasure in her body began to build up again.

I-It felt so, so good. So simple. So easy. Her muscles relaxed as her mind fluttered adrift with pleasure and ecstasy. A few minutes later, her only squirms and struggles were to maximize the amount of pleasure from her predicament.

Her doctor had been right. She was Kasumi Yoshizawa, and she was perfectly happy.