A device to help her with her concentration problem.

A door opened silently, and Asami guided Korra into her private workshop. Both women were completely naked, though that was hardly surprising, considering how much time they had spent fucking each other. What WAS surprising, was Korra.

The young avatar was naked, as mentioned, and any who saw could appreciate her great physique, and even greater tits and ass. What stood out though, was the rope. Ropes tied Korra's wrists together in front of her, causing her arms to squeeze her breasts together. A rope encircled each breast once, resulting in them sticking out just a tiny bit more. More ropes ran down her stomach and back in a diamond-shaped pattern, before the two ends ran between her legs to go up between her shapely ass cheeks, and were tied up against another part of the rope. A short piece of rope ran from between her wrists and was tied to the rope around her waist, preventing her from raising her arms. The knots and ropework were just tight enough to limit her movement, giving her a sense of restraint, but not so tight that she couldn't break them if she really wanted to. And if the shade of red on her cheeks and hardened dark nipples were any indications, Korra had no intention to break out and ruin all of Asami's hard work. To finish off, a blindfold was wrapped around her eyes, rendering her completely blind, and unable to see or react to whatever Asami had planned. The blindfold was made from soft silk, that was dyed a fire nation red, while the ropes were dyed water nation blue.

Korra slowly walked forward as Asami guided her toward the device she had been working on for the past few days.

"Not that I don't like this side of you sweety, but where are you taking me?"

Asami positioned Korra in front of a custom made wooden chair, and gently pushed on her shoulders until she sat down. She took one of Korra's legs while she began explaining her plan.

"I heard from Tenzin about how your training was going. Or rather, how it wasn't."

She had moved Korra's leg towards one of the chair's legs, and wrapped a soft leather belt around her ankle, securing it in place. She did the same with Korra's other leg and stood up again.

"Now I know you love. You need to be pushed. You need to be put in a situation where you need to do it or die. And we both know Tenzin and Jinora wouldn't push you that hard. And I can't stand to see you all disappointed or angry all the time, so I took it upon myself to help you."

She reached behind Korra's back and rotated a small metal hook out of the backrest. She hooked it on the rope that ran across her back, effectively securing her back against the backrest. This, combined with the ropes Asami used to tie up her girlfriend, ensured that Korra had no way of escaping her situation.

This was not true, of course. The ropes were tied in such a way that Korra could pull free if she REALLY wanted to, and the hook was secured to a deadbolt that would release itself if enough **** was applied. But unless Korra really got into a struggle for life situation, she was helpless, and at Asami's tender mercies.

"Uhu. And how is this exactly going to help me? Don't get me wrong, you have no idea how wet this makes me, but I fail to see how this is going to help with bending training?"

Asami stepped to the side of the chair and leaned in a bit so her face was more level with Korra's. At the same time, she began to use one of her hands to caress her lover's naked body wherever she could reach. Korra let out a soft moan of appreciation as Asami's nails drew sharp lines across her skin.

"Simple. Tenzin told me that the biggest problem you have is keeping your concentration up when things don't go your way. You get impatient, hot-headed, reckless. So I made this device just for you. It will put you in the kind of dangerous situation you need, without risking any lives or properties."

Asami's hand had reached one of Korra's soft breasts, and she gave it a playful squeeze.

"Do well enough, and you might even get a reward."

To prove her point, she leaned closer and captured Korra's lips with her own. Korra immediately reacted by opening her lips and returning the kiss. Asami pushed her tongue out, and for several moments, the two women were passionately kissing each other. Korra had surrendered herself to Asami at this point, and she allowed herself to be completely dominated by her girlfriend. Asami broke the kiss, causing Korra to wine in disappointment.

"rewards like that, for example. Or maybe even something like this."

This time, Asami's slender fingers pinched one of Korra's hard nipples, causing the other woman to moan softly from the sharp pain.

"So, are you ready to earn that reward?"

"Yesss."

Korra's response was a husky affirmation as the lust and desire for Asami had all but worn away any trepidations she might have had.

"Good, then I want you to create that bubble of breathable air around your head. You know the one I mean. It's the one Tenzin taught you a while back."

Asami watched as Korra concentrated on the difficult technique, and after a while, the air around her face began to swirl gently, until it had formed into a roughly spherical field. Asami leaned into the field, noticing how the warm air caressed her skin. Even now, she recognized the warm energy that always accompanied Korra's bending. She put her mouth as close to Korra's ear as she could, and spoke in a soft, seductive manner.

"Ready to begin love?"

Korra could all but nod, maintaining the sphere taking most of her concentration.

"Then here we go, and remember; Whatever happens, don't lose your hold on that technique."

Asami stood back up, and with one hand reached for a handle fitted to the side of the chair. there was a metallic *click* as a safety bolt was pulled back, and the chair swiftly tilted backwards, taking its helpless occupant with it. With a splashing sound, Korra's head and upper torso were dunked into a large glass tank of water. The shock of being turned over, and the water that is slightly below room temperature, caused Korra to jerk against her bonds. Asami saw Korra's hands open and close in fists as her arms strained against the ropes. Her chest rose and fell enticingly as she took panicked breaths. At the same time, the shock broke enough of her concentration that the already rough field of breathable air began to deform further until it began to collapse after a few seconds. Asami watched carefully as Korra struggled to escape, while at the same time trying to reform the rapidly dissipating supply of air. She failed at both, and a second after the bubble disappeared completely, Asami pulled the lever again, and the chair tilted back into its upright position.

Korra coughed and sputtered as she took big gulps of air.

"Wow, I heard you were bad at this, but that was really, REALLY short. I thought you could hold it longer than that. Maybe I should punish you for being this bad. "

Korra was still trying to get past the shock of what happened. Her arms and legs strained against the ropes holding her secure, but Asami saw that she was not truly trying to break free of them. Not just yet. After a moment though, she had recovered enough that she could speak again.

"What the hell was that Asami? How is this going to help me improve? I almost drowned just now."

Asami stroked Korra's cheek with her hand, relishing the soft touch of her skin. She noticed that Korra instinctively leaned into her hand, telling her that Korra's anger was mostly from the shock and surprise, and not really because of the situation.

"Simple love. You have to keep the airflow going, otherwise, you lose your supply of air. As you just found out. Don't worry, I'll be here to make sure you don't really drown. But I'm not going to go easy on you either. Now stop complaining, and reform that sphere. You have ten seconds before you're going under again."

"But... But... That's too soon. I don't know if I can do it that quick."

"Then you better learn. Five seconds left, by the way."

Korra questioned herself for a second before she began to reapply the air bubble. Asami waited seven seconds for the technique to hold before she pulled the lever again.

With another splash, Korra tilted backwards again, and her face and upper torso disappeared underwater. This time, she was prepared for what would happen, and the effect of hitting the water was much less. The field did deform for a bit, but save for a few droplets of water, nothing serious happened. Asami smiled proudly. Just now, Korra doubted she could do the technique that quick. But she already showed that she could do it fast enough if she really needed to. Korra's lack of self-confidence has always been one of her bigger handicaps, and she was happy to see that her idea was working so far. Asami was tempted to go easy on her lover. She hated seeing Korra suffer in any way whatsoever, but this was exactly the kind of situation that would push Korra as she needed. And if she doubted, she had only need to look at Korra's blindfolded face, and the bubble of air around it that was slowly showing signs of growing stronger.

Asami watched as Korra struggled to maintain the bubble. It was a difficult technique. Pulling what little oxygen from the water and using it to supply the bubble was hard work. And sure enough, the few droplets turned into a steady drip, then a stream, until eventually, the bubble collapsed, and Korra's face was submerged in the water again. She watched carefully to see if Korra could reform the bubble, but when it was clear that she couldn't, and her struggles against the ropes became more frantic, pulled the lever again to allow Korra to breathe.

Korra took deep breaths and tried to calm herself as quickly as she could. She knew that she needed her full concentration to create and maintain the bubble. She also rightly suspected that Asami would not give her all the time in the world to recover. And sure enough, far sooner than she wanted, she felt herself tilt backwards again. She had just enough time to take a deep breath before her face hit the water. Forming the field underwater was hard, but she managed to do it. Eventually. But even blindfolded as she was, she could tell it was sloppy, and would not hold for long. When drops of water began to hit her face, she knew her time was up.

She felt the water begin to fill the bubble, and when it began to pour into her mouth, she lost all control over it. There was a brief moment when the technique slipped from her control before her entire face was submerged in water. The sudden rush overwhelmed her, and she instinctively opened her mouth to take a last breath of air. But it was already too late, and instead of air, her mouth filled with water. She began to cough and had to resist the urge to open her mouth again. The ropes dug into her wrists as she tried to pull them free. Likewise, her chest constricted painfully when she tried to raise her head above the water. The hook attached to her back kept her torso in place no matter what. Korra dug deep for whatever reserves she could find, and desperately tried to reform the bubble. There was a short moment when she felt the water recede, and she took a big gasp of air before the water rushed back. She struggled like this for some time, until she felt herself being tilted upright again.

Asami's calm voice was the only indication she had that her girlfriend was still there, that it was still going as she had planned.

"See, we've only started, and I can already tell you are improving."

Korra could only nod, far too preoccupied with recovering. She had to make most of what little time Asami would give her. When she was starting to calm down again, a metallic click was the only warning she got before her world began to tilt again. This time though, she managed to form the air bubble before she hit the water. And while she felt some water leak into her precious air supply, it quickly stopped once she concentrated on strengthening the bubble. Keeping all her focus on maintaining the bubble, she was caught by surprise with what happened next.

A pair of soft, warm hands, Asami's hands, began to wander all across Korra's body. The touch was pleasant, Asami knew exactly what Korra liked, and where she wanted to be touched. unfortunately, with the welcome touch of her girlfriend's hands, her concentration was being split between enjoying what Asami was doing and maintaining the air bubble. Before she realised her mistake, the water was already flowing in, and by the time she found the concentration to strengthen the bubble, the water had already risen to just under her chin. She could not afford such a mistake again. Unfortunately for her, Asami was not done yet.

Asami's hands had stopped their wandering moves and rested squarely on Korra's breasts. She waited for a second to let the anxiety build before she began to squeeze and massage Korra's firm breasts. Korra didn't mind it when things got a little rough, in fact, she actually liked it. And Asami took full advantage of her helplessness to **** her sensitive tits as much as she wanted. Korra began to moan softly as the pleasure began to rise slowly. Then moaned harder when Asami used her nails to pinch her nipples. That proved to be her undoing, as her concentration broke, and with it, the bubble. There were a few seconds of panicked drowning before she was tilted upright.

After taking a moment to recover, Korra glared toward where she thought Asami was. Though the effect was ruined because she had her head turned the wrong way, and the blindfold covered her eyes.

"Okay, that was cheating Asami, and you know it."

Asami's soft laughter came from her other side, and Korra turned her head towards where she now knew her girlfriend was.

"Well, you can't expect me to just stay here and watch. Do you have any idea what a turn on it is to know that you are the only woman in the world that can have the avatar tied up, helpless, and squirming in her hands?"

Korra wanted to say something, but two fingers were swiftly pushed into her mouth. She began to suck on them and tasted the familiar taste of Asami's love juices on them.

"That is how hot it is to see you like this. To know you trust me enough to let me do this. But enough talk, let's get back to your training."

Korra had just enough time to form the bubble before she hit the water again. This time she was prepared when Asami began again. And as much as she wanted to just give in to her desires and enjoy her lover's touch, she knew that doing so would mean a swift end to the bubble, and thus an end to Asami's hands playing with her breasts and nipples. She lasted almost a minute before it became too much. Korra was never one for patience, and simply sitting there and letting Asami have her fun with her body without being able to do anything proved to be too difficult. Despite knowing she shouldn't she pushed her chest out into Asami's hands and surrendered to whatever she wanted to do. Not long after, Korra was panting and taking deep breaths as she had once again failed to maintain the bubble.

Three more times this was repeated, before Korra finally learned the lesson, and focused entirely on maintaining the bubble. After five maddening minutes, the bubble showed no sign of weakening anymore, and it was even improving in shape to be more spherical. Progress was being made. One teasing minute after the other, but she was getting there. One of Asami's hands left her breast and she made a small wine from the loss of touch. Though it became a sharp gasp as she felt slender fingers begin to trace the outside of her pussy. her wet, exposed, and extremely sensitive pussy. The moment Asami brushed a finger across her clit, she knew she was done for. Her body contorted in her bonds as a wave of pleasure tore through her body, shattering her concentration, and causing an immediate end to the air bubble.

"Aww, and here I thought you had it."

Korra was once again panting for air, but this time, there was a hint of arousal mixed in. Asami's actions were starting to have an effect on her body.

Well, no matter, we have plenty of time to make it perfect.

Korra was given no time to react, as she was promptly placed back underwater. She was just in time with creating the bubble and idly noted that she had gotten quicker with forming it recently before Asami started again.

It started slow, teasing, drawing out the anxiety that both women knew what was going to happen, but only one knew when. And just like before, Asami's fingers against Korra's pussy were simply too much for the young avatar, and she had to be pulled out of the tank again.

After the eight-time, Korra had finally steeled herself enough to resist Asami's expert touch. Asami knew exactly where to touch Korra's sensitive pussy to provide the most pleasure, and she used that knowledge with sadistic efficiency to test her concentration. But Koora held on, at last. Even when Asami began to rub her clit she managed to keep enough strength to not drown. And the reward? Two fingers slid smoothly into her soaking wet pussy. She should have expected that move. Part of her had, but it still caught her by surprise, and she felt her control over the bubble falter with each second. The moment Asami moved her fingers around, rubbing them against her most sensitive spot with just the right amount of pressure, Korra lost it all, and the bubble fell apart around her.

Again and again, Korra and Asami repeated the same thing. Forming and maintaining the bubble was as easy as breathing now, and could be done in less than a second. Most physical distractions didn't cause too much of a loss to the bubble's cohesion. But whenever Asami focused on her pussy, it proved so much more difficult to maintain. But as the minutes slowly turned into an hour, and then two, there was some progress to be seen. Despite the clear struggle, Korra managed to hold the bubble while Asami used her fingers to play with her lover's pussy.

Eventually, they had gotten to the point where Asami could actually thrust her fingers back and forth, gently fucking Korra with her hand. Korra for her part was struggling with the raging desire inside of her, as well as keeping up the concentration to keep breathing. Now that Asami was straight up finger fucking her drenched pussy, hitting all her sweet spots doing so, Korra beginning to build towards orgasm. But since she lost the bubble before she could reach that point, she never managed to cum just yet, and it added another layer of difficulty to her already straining mind.

She had no idea how long they had been doing this. Several hours at least, and even though Korra could admit that Asami's idea was working wonderfully to help her improve, it was also driving her crazy with frustrated desire. She knew how Asami thought, she stopped the moment the bubble collapsed, so if she wanted to have any chance of cumming, then she had to keep the bubble up until the end. And she knew it would be over the moment she could cum.

So with newfound determination, Korra put all her effort into reaching the end. And upon noticing this, Asami put aa her effort into giving her girlfriend as much pleasure as possible. It took many more tries, but eventually, Korra reached the end.

The pleasure had been building for a while now, **** for a chance to be released. She felt it surge inside of her, rising higher and higher with each thrust of Asami's fingers, each stroke across her throbbing clit. Her entire body tensed up as the pleasure reached its highest point, and with a piercing scream of pleasure that was lost underwater, Korra's orgasm exploded from her body. Every inch of her nerves was on fire with pleasure, it was the single strongest orgasm she had ever had in her young life. Her entire body shook and twitched in convulsions as wave after wave of pleasure wiped her mind clear of anything other than orgasmic release. And that was precisely what she should have tried to prevent.

Water splashed against her face, and her mouth, still open as she moaned and panted with pleasure was filled with water, and she began to cough frantically. A second later, she was upright, and the familiar warmth of Asami's arms wrapped around her.

"I knew you could do it, love. That was the hottest thing I have ever seen."

Asami pressed her mouth against Korra's, and for several minutes, the two women spent kissing each other while Korra slowly rode out the powerful aftershocks of her orgasm. When it was clear she had fully recovered, Asami broke the kiss and stepped away.

"But we're not done just yet. You reached the end, yes, but you broke the bubble, so it doesn't count. So let's try again. And this time, make sure you keep it up until everything is over.

Korra could not complain, she would always do as Asami requested, and if the result of her desires lead to orgasms this strong, then who was she to complain. It took them another two hours, and at least ten more orgasms from Korra, but eventually she managed to ride out her orgasm underwater with the safety of the bubble protecting her.

This time, when Korra was pulled out of the water tank, the blindfold was removed, and she saw Asami's face for the first time in hours. Asami began to undo the straps holding her legs in place, and with a few practised pulls, undid the knots holding the ropes in place. She reached out her hand, and Korra took it to allow herself to be pulled out of the chair. For a moment, the two women looked at each other, before Asami broke the silence.

"So, how about we call it quits here and take it easy the rest of the day?"

Asami began to lead Korra towards the door, intent to take her anywhere that was not her workshop, but Korra had other plans. With an amount of strength that Asami had not expected from Korra after all this time she was pulled back and turned around until she stood face to face with the avatar. Korra's blue eyes burned with passion and love, and it was the only warning she had for what happened next. Asami was pushed back until her legs hit something, and as she buckled under Korra's aggressive ****, found herself sitting on her workbench. A few tools clattered to the ground from the ****, and she gave a soft gasp as Korra began to plant kisses all over her body. Starting with her breasts, then going up along the side of her neck, along her chin, until she reached her mouth.

"Thank you. For helping me. For being there for me. And for loving me."

Asami wanted to say something, but Korra had already dropped to her knees and began to passionately lick and suck at Asami's pussy.

Suffice to say, they didn't call it quits. And they certainly didn't take it easy the rest of the day, or the night for that matter. And Asami probably had to reorganise her workbench the next time she wanted to work. though that was a small price to pay when it came to helping your girlfriend.