Chapter Text
“So let me get this straight. Your only quirk is being able to shrink yourself?”
“Th-that's right, Miss Mirko,” the young hero-in-training Micron said to his new mentor, looking much abashed as she eyed him thoughtfully. He was too shy to admit it, but in truth he had always looked up to Mirko as his favorite pro hero ever since he was a boy, not least because he thought she was very pretty. Being able to carry out his internship with her was something of a dream come true, but it also made him a bit ashamed as he knew he could never compare to someone like her.
“And do you get any advantage from being small?”
“Well, I'm much more durable when I shrink down. Durable enough to survive a building falling on me.”
“Oh? Do you also get stronger, or faster?”
“Yes... but only relative to my size. At my smallest size, my strength increases a hundred times and my speed ten times, relative to my size.”
“And is that all? I'm sorry, kid, but I just can't see how I can get any use out of powers like yours.”
“Y-you could use me for reconnaissance! I can sneak into villains' bases undetected and spy on them for you, tell you where they are and where to attack!”
“No offense, kid, but sneaking isn't really my style; I prefer to go in guns blazing and take out my enemies with a few good kicks! Maybe your quirk is useful for some things, but it doesn't mesh with my style of crime-fighting at all. Though, maybe if you show me what you can do I can come up with some use for you. Why don't you go ahead and shrink down to, say, one inch?”
“Right away, miss!” Micron said, focusing on himself for a moment to shrink himself down. Once he was at an inch tall, he looked up at his idol, his heart fluttering as her colossal form dominated his view. Her muscular legs were like pillars stretching up to the heavens, and her statuesque figure was downright monumental in its new size.
Mirko slid a foot closer, comparing her size to his and finding that he was only a little taller than her toes. Then, without warning, she bopped Micron on the chest with a toe, knocking him flat on his back, and before he could get up she set her big toe down on his body.
“Alright, let's see that strength you mentioned. Can you at manage to push my toe away?” she asked. Micron put all his effort into pushing her toe off of him, and with trembling arms he did eventually manage to push it as far as his arms could stretch. But when Mirko pressed down with just a little bit more effort, his arms instantly collapsed, letting her finger pin him down again. “That's all you can do? I didn't expect you to lift me up, but I thought at least you'd be able to handle a single toe,” Mirko said with a shake of her head. “Well, let's see if your endurance is any better than this.”
Moving her foot forward until Micron was under the ball of her foot, Mirko slowly let more and more of her weight come to rest on that foot until all her weight was bearing down on him. At first Micron lay still, too surprised to react to it, but as the pressure kept increasing, he started trying to wriggle free from Mirko's foot. Not because he was hurt or in danger of being crushed, but because he was slowly suffocating under Mirko's sole. By the time Mirko's full weight was resting on him he was too weak to even struggle against her, and he passed out soon after that. He awakened a minute later in Mirko's hand, hungrily filling his lungs with fresh air.
“You alright?” Mirko said. “Sorry about that; guess I got a bit carried away. Still, if you can't stand being under my feet for a few minutes, and you don't even have the strength to lift a single toe up, then I really can't see how you'll be any help to me in battle. Maybe you'd be better off with another hero who can make better use of your quirk.”
“No, please!” Micron yelled as his breathing finally settled down. “Miss Mirko, I've looked up to you ever since I was a little kid. There's no other hero I'd rather work with than you. If you think I'm too weak then I beg that you train me until I can be of use to you. I swear I'll put everything I have into it!”
“Sounds like you're pretty determined to work with me. Gotta admit, I really like that,” the heroine said. “Alright! I'll see what I can do to train you. But first, I need you to shrink smaller so your training can be more effective. Can you go down to half an inch?” Micron did as she asked, giving up half his remaining height. “Perfect! Now we can start your training.” Mirko tugged on the neck of her shirt and tipped her hand back, sending Micron rolling down her palm until he fell right in her shirt and into her cleavage.
Clawing his way back up, he looked around and blushed as he realized where he was. “M-m-miss Mirko? What am I in here for?” he asked.
“Training, of course! In a minute I'm going to get started on my workout and you're going to try to endure it without passing out or slipping out of my cleavage. Think you can manage that much?”
“I...” Micron began before choking over his own embarrassment. “I'll do my best, miss.”
“Great! I'll check in on you in a bit, then,” Mirko said, letting her shirt snap back into place and heading for the training room. As she walked, her breasts bobbed with every step, each bounce making Micron slide a bit further down. After the second time he reflexively placed a hand on each of the soft walls to either side of him, holding himself in place for a few steps until he realized that he was technically groping Mirko's boobs. The thought made him so flustered that his grip faltered and he slipped further down, until his legs got wedged between Mirko's boobs.
Shaking his head, he told himself to ignore where he was, then climbed back to where he had been at first. By then Mirko had reached the training room where she decided to start with the treadmill. She hopped on and started jogging, and all of a sudden her boobs were bouncing more violently than before. Micron was caught by surprise at first, but he quickly recovered and managed to keep himself in place with a firm grip on Mirko's skin.
Over time, however, sweat started seeping from Mirko's pores, making her skin wet and slippery all over. Despite his best efforts, Micron started sliding deeper into her cleavage, even past the point where his legs had gotten wedged before. He got so deep into it that his body was completely encapsulated by the flesh of Mirko's boobs, and he could no more breathe than he could when she had been stepping on him. He felt his mind start to slip, but knowing that passing out would mean disappointing his hero, he summoned up his strength and managed to push the walls of skin far enough away to get a few breaths in. After that he climbed up until his head was sticking out and held himself there, figuring there was no point in climbing any higher.
He held himself in place until Mirko stopped jogging, giving him a quick break and letting him stay put without issue. A moment later she lay down, letting Micron also lie down on her, thinking he'd have an easy time with this exercise. So he thought until her boobs suddenly squeezed him tight, pressing the air from his lung. They eased up on him a second later, only to squeeze together again as Mirko did some dumbbell flyes.
Micron thought about crawling out from between her boobs on one of the times when they eased up on him, but that would defeat the purpose of his training. Instead he learned how to let the air leave him when he was squeezed between the boobs and to breathe in when he had the chance. He also tried to see how long he could stay conscious without air, but that was too much for him and he soon gave up on it.
By then it was getting uncomfortably hot and stuffy inside Mirko's shirt, with a thin sheet of sweat covering every inch of her skin and soaking into his body. It became a real struggle just to stay awake with what little air he could get, but he managed to hold on until Mirko finished her reps and sat up.
Sighing as she wiped the sweat off her brow, she grabbed her bottle of water and took a few sips. Micron licked his lips as he heard the water going down her throat, hoping she would offer him a drink, but instead she just went on to do another exercise, leaving him with his growing thirst. He licked his lips again and this time found a bit of moisture on them; Mirko's sweat. Upon tasting the salty substance he grimaced and prepared to spit it out, but then reconsidered and after a moment he drank up a few drops of sweat.
These were enough to tide him over until Mirko finally pulled him out of her shirt and dropped him on her open palm. “How are you holding up, kid? I see you're still awake and you managed to stay put; that's good! Think you can handle some tougher training now, or should I put you back in there?”
“I think I can handle it, miss Mirko. Um, what exactly do you have in mind for me?”
“It's basically the same thing you've been doing so far, just in another, more intense location. But first, you should shrink down to your smallest size so you can make the most of this training.”
“Right away.” Micron closed his eyes and focused for a moment, shrinking down to his minimum size of a millimeter tall. When he opened his eyes again, he was filled with a sense of dread and awe at the sight of his idol's face filling half his sky.
“My, you're so small,” she said, her voice rumbling like thunder over her palm. “You know, seeing you like that makes me feel even bigger and stronger. If this training doesn't work out, maybe you could stay that size to keep me motivated while I'm out fighting crime.” She set a fingertip down next to him, its impact knocking him on his ass and leaving him staring up at her fingernail. “Heh! You're kinda cute, too. At that size you would probably make for a good pet. But enough of that; I promised you a more intense training, so let's get started!” Mirko picked him up between her fingers and bent over, bringing him over to the opening of her training shoe. Micron started having second thoughts once he saw where she was taking him, but Mirko dropped him in before he could voice them.
He landed with a bounce on the imprint of Mirko's heel, then gazed through the opening at Mirko's face. “Last time I had you under my foot you passed out in under a minute. Let's see if you can manage better this time.”
Seeing Mirko's toes appear over the opening and start to slide in, Micron took a step back, startled by their rapid approach. They quickly fell on him, holding him against the insole and sliding him further along the length of the shoe until he was right in the middle of it. Then her sole slid over him to leave him pinned helplessly under the ball of her foot.
Smothered by Mirko's sole, he was starting to pass out again until the heroine raised her foot to take a step, giving him a brief moment of rest as he was swung through the air along with her foot before it came slamming down on top of him. It was very similar to what he'd experienced in Mirko's cleavage a little while ago, but even more intense than that. Worse, it was even stuffier inside her shoe than it had been in her shirt, and also smellier. He tried his best to stay conscious , and to his credit he did better than the last time around, but the tremendous forces he was dealing with, together with the sheer intensity of the stimuli he had to deal with, gradually softened him up and drained him of all energy, until he was on the edge of unconsciousness, roughly aware of what was going on but unable to think. All his conscious effort went into keeping his breathing up; beyond that, all he was aware of was Mirko's foot as it effortlessly dominated him, making him feel like a mere bug stuck to her sole, next to whom she was as a goddess.
That his idol held such power over him actually made Micron love her even more, and unconsciously he started licking and kissing her sole in reverence, even welcoming her foot sweat as it spilled into his mouth. He was still at it when Mirko stopped and took her shoe off, having finished her training for the day.
“You doing good in there? Kid?” she asked, peering into her shoe and shaking it around to look for him. When she found no sign of him, she turned her foot over instead and pored over her sole, eventually finding him between a pair of her toes, still fervently licking her sole. Much amused by the sight, she chuckled and wiggled her toes around him, then clenched them, burying his whole body between them. “Ha! Looks like someone's enjoying himself! I guess my foot was too much for you to resist. Well, to be honest, I don't mind it; if you like it so much down there, you can stay for as long as you want. Oh, and while you're at it, why not clean my foot up, too? Think of it as extra credit for your training. Do a good job and I might even take you on as my helper to pamper my feet between missions.”
Mirko watched in delight as the young intern started crawling over her sole, eagerly licking up her sweat and wiping off any speck of dust that covered it. Wiggling her toes again, she put her shoe back on and left the training room, walking with a pep in her step thanks to her little foot worshipper.