Anna was still horny after the concert. She had played the events that had just happened in her mind over and over again. Stress might have been the norm for her and she sometimes found herself engulfed in it, but rare was it she was taken over by joy. She would be a famous scientist, her great boyfriend was shrunken and totally (and willing) at her mercy, and she’d just had some wild sex with her favorite pop star. Life was too good. She and Joe had ended up having more sexual adventures together until the wee hours of the morning. They stayed up so late that they fell asleep on the couch together. Anna woke up later than usual and saw that she was late for work. She left in a rush, neglecting to regrow her still sleeping boyfriend and left him alone. “He can have a great day exploring at his height” she said to herself. However, in that same rush that she left the apartment in, she also had forgotten to take the shrink ray with her.

A few hours passed. Joe was so tired that he found himself sleeping well into the afternoon, dreaming of future giantess adventures that were now his reality. He was then awoken by the sound of the front door being unlocked. He rubbed his eyes and collected himself after his rude awakening. Expecting to see Anna again, he was surprised to see it was in fact Anna’s younger sister Lauren.

Lauren was only a year younger than Anna, and shared much of her beauty. You might have sworn the two were twins. She had long blonde hair, double D cup breasts and she was very playful in and outside of the bedroom. On top of that she had a terrific athletic body, and through years of doing heavy squats she had built up a butt that left all onlookers, men and women alike, very envious. Lauren came over because she wanted to borrow a few of Anna’s special cooking pots. They were perfect for making cakes and Lauren had recently been tasked with putting together something special for a friend’s birthday. However, the subject of pots left her mind virtually immediately the moment she spotted shrunken Joe on the couch with her keen eyes, the little man still trying to gather himself having been awoken from a lovely dream.

Lauren came over in a rush, almost skipping in excitement. She’d already heard about the shrinking ray and Joe’s volunteering through Anna and her friends, but she didn’t know she’d be reacting to actually laying eyes on him with such joy. The sight of another giant woman hovering over him electrified him awake, mild anxiety rushing up in his chest. Joe had a good relationship with Lauren, but he always had concerns that she didn’t take things as seriously as she really should have. He didn’t trust her with money or any other valuable belonging, so he wasn’t sure what to make of Lauren looking over him with a bit of lust in her eyes.

Lauren dropped down to her knees and slammed her hands down on the couch, causing Joe to lightly bounce off his feet and then fall on his backside from lost balance.

“Joe!” she exclaimed, “I can’t believe it! You’re so fucking cute! I could just cuddle you!”

Joe was nervous. “Lauren, I know it’s a shock, but take it easy. I’m very fragile at this size, now let me explain—”

“Oh, I’ve heard ALL ABOUT IT, Joe!” Lauren said excitedly, trying to reassure him but going about it in a less effective manner than she thought.

“You… you have?” Joe said, taking a nervous step back.

Lauren smiled at him lustfully. “Mhm! And let me just say that I don’t think I can resist you right now!”

Joe started to feel even more nervous. Lauren had never shown any attention like this in the past, and he was concerned that she wasn’t thinking objectively right now for whatever reason. He couldn’t even tell if she found him ‘cute’ like a sexy boy, or like a bunny rabbit. He had to put an end to this; stop her plan in its tracks if she had one.

“Lauren, I don’t think you’re thinking very clearly right now. In fact, at this very moment I don’t think you’re concerned about me in the way you should be. I reiterate, you must be delicate!”

Joe started to shift his weight between his left and right feet, a nervous habit he’d picked up in elementary school. He didn’t do it often, but right now it almost looked like he was doing a light dance.

“Oh my god!” Lauren wailed, taken completely by surprise at Joe’s nervousness. “You’re just too precious!”

She slapped her palms on the couch again, shaking Joe further. This was not looking good at all.

“Lauren, please…”

Before Joe could say any more, Lauren launched herself into the air, did a twist, and then landed comfortably on the couch on her butt. Her athletic prowess was clearly being shown. Years of gymnastics, tennis, and competitive swimming had turned her into a fine athlete. If it wasn’t for family pressure to go to college, Lauren might have had a shot going to the Olympics or playing on the national level in a team sport. Her butt landing on the couch made a loud ‘clamp’ sound, and the force knocked Joe off his feet and on his palms. Joe did not want to see how the situation would develop further. He wasn’t getting through to her. For the first time since he was shrunk, he felt genuine fear. He’d tasted intense arousal, a grand sense of wonder, and looked forward to the future so much it gave him butterflies, but this was terror. He got to his feet and made a run in the opposite direction, not really knowing what he was going to do once he reached the other side of the couch.

Lauren giggled like a schoolgirl as she watched Joe run. “Awww, aren’t you such a cutie! Where you gonna go Joe?!” She highlighted a valid point, but Joe only quickened his haste.

Lauren reached over with her monster hand and slammed her palm down on its side in front of Joe, effectively creating a big fleshy wall. Before Joe noticed it, he ran right into her hand at full speed, falling back down on his backside. The experience was mildly humiliating. He hadn’t done anything like that since he was 7 years old. Before he could gather himself again, Joe found himself being enveloped inside Lauren’s fist and lifted into the air. Things were now really taking a frightening turn. Any sense of control still lingering in the back of his mind was shattered, as he now found himself at the mercy of his girlfriend’s little sister.

Lauren let out a pleasurable sigh. “You’re just too gosh darn adorable to be left here by yourself, Joe. I think we can have a lovely afternoon together you and I.” Her lips formed a cheeky smile and she nodded her head as if agreeing with herself. “Oh yes, it’s gonna be GREAT!”

“Lauren, please, you have to calm down! You have to—”

Before Joe could get another word in, he found himself surrounded by something squishy. A very familiar sensation. Breasts. Lauren’s breasts. They felt just like Anna’s, but Lauren’s scent was remarkably different. No less pleasurable, but he couldn’t even pretend that this wasn’t Anna and that his captor didn’t understand the situation nearly as well. He could feel her walking, the little bounces in her breasts indicative that she had a real spring in her step. Joe tried to say something, desperately wanting to get through to her, but he was silenced by the fleshy mound of boob fat pressing into his face. Lauren saw the shrinking device Anna recklessly left laying around. She picked it up, and after grabbing the pots she came for initially and went about her day, a tiny prisoner trapped between her massive boobies. Joe had no idea where he was going to be taken from this point on.

Lauren walked into her gym, hungry for her daily workout. She was truly insatiable on this front. She removed Joe from the depths of her cleavage to give him a look around. Fit people in every direction. Fit GIANT people. He wasn’t sure what to make of the situation, but his mind raced to all kinds of undesirable scenarios given his anxiety.

Lauren went into the change room. She placed Joe on a bench and started stripping her clothes off. It was unbelievably. Never would he have expected his girlfriend’s sister to remove her clothing in front of him, let alone without the slightest bit of concern, but it was clear that his miniscule state had altered her perceptions. One thing was certain – she didn’t see him as a human equal anymore. He was now a toy to be played with. Lauren first pulled off her top, given him the best look at her breasts that he’d ever had, albeit contained within a tight sports bra. Next, she removed her jeans. They did little to hide the size of her ass, but it was truly something else to see her in no more than her underwear. It added a whole new dimension to her beauty. Despite his terror, Joe couldn’t help but be turned on. He stared at Lauren’s body, mouth wide open with lust, and Lauren caught him doing so.

“You know, LITTLE Joe, that it’s not polite to stare! Didn’t your parents say you should leave the room when somebody is getting changed? Oh that’s right, you can’t! You’re stuck on the bench!”

“I’m… sorry, Lauren” Joe said nervously, unsure if any of what she said was serious.

“Gosh, you could have been a gentleman and turned around!” Lauren said, breaking out into a cackle. “But, you know what? Have a good perv! I know you like my body! I’ve seen you peeking at me before, don’t deny it.”

Joe was in no position to bargain. He thought it best to follow instruction. If he was to endure being Lauren’s prisoner, he could at least enjoy it as much as he could. He’d speak to Anna later and get the entire situation sorted out… or at least he hoped to.

Lauren changed into her gym wear. Black legging and a spandex training top that seemed to squeeze her big boobs together even more than before. Joe couldn’t help but imagine that there was no way it was comfortable, but of course had no personal reference on such things. Lauren then looked at him mischievously.

“So what am I going to do with you?!” she teased.

Joe didn’t know what to say. He found himself looking anywhere but into Lauren’s eyes, feeling very uncomfortable at her tone and expression.

“Cat got your tongue, Joe?” Lauren said. “Doesn’t matter, I’ve already thought this through!”

Before Joe could even mumble a word, Lauren’s monster hand lunged at him. Suddenly his world became very dark and very tight. This wasn’t cleavage. The flesh surrounding him was much more… firm. He took note of the stale odor and made a conclusion.

He was inside Lauren’s panties, trapped at the crack of her ass.

Lauren gave him a few tight squeezes with her powerful glutes. The pressure was greater than anything Joe had felt in his life up to this point. It was very clear that Lauren took great pride in her leg training, her butt so strong that she could open a jar of pickles with it. Then she started to walk, each step appearing even more menacing than the last. With every step that Lauren took, he seemed to be pushed back and forth within her pants. Step on the left leg, her left butt cheek would tighten up and push him in the fleshy right cheeky. Step on her right leg and the reverse would happen. It made Joe feel like a piece of meat that was being tenderized from multiple directions.

To start her workout, Lauren settled on squats. Only appropriate to train the very thing causing Joe so much distress (with a hint of arousal). She loaded up the weight, heavy enough to give her a challenge, but light enough to allow enough repetitions just to really rub things into little Joe.

“Prepare yourself Joe!” Lauren teased. “See this ass that you’ve been staring at for so long? This is how I made it so magnificent!”

Joe couldn’t tell what she meant by this exactly. He couldn’t even place her location anywhere in the pitch black of her crack. However he had some unpleasant ideas; ideas that would turn out to be true.

Lauren picked up the bar on her shoulders and took a step back. Immediately Joe noticed the tension in her butt get amped up. Suddenly, he felt a sudden drop and Lauren’s cheeks spread out wide. He ended up falling out of her crack and against the fabric of her underpants. Although he couldn’t seen it in the darkness of her pants, Lauren’s asshole was exposed to him and almost inviting him in. If not for the blinding situation he may have even found it inviting. However, Joe knew this couldn’t last long. Something bad was coming.

Joe felt a fast move upwards again. At the same time as he felt that rush, he felt Lauren’s ass tighten up once again and envelope him within her cheeks. It was like a ferocious beast, as Joe felt the life being squeezed out of him by these monstrous glutes. No question, there was a sexy element about the whole thing. Lauren doing squats while he was trapped by her ass, but he couldn’t deny that it was also too much. It hurt and his airflow was constricted.

“How was that one, Joe?!” Lauren teased. “I try to do at least 8 reps per set, so we have 7 more to go!” She then flexed her butt repeatedly to shake him around a little, really rubbing in the humiliating situation. The only benefit of the first rep being done was that Joe knew what to expect, but he had no chance to prepare for it. He was totally powerless against the might of Lauren’s well-trained buttocks.

Lauren ended up finding more strength than she anticipated. She managed to push herself all the way through 12 squat repetitions on that set. It had to have been the arousing influence of Joe’s presence. She wanted to ‘impress’ him in a very demented way. This workout would go on for another 3 sets after this. More than 30 times Joe found himself dropped out of her crack and trampolining against her panties, only to be grasped again by those titanic butt cheeks and have the life squeezed out of him. Even if there was something deeply arousing about it all, and he had always wanted to be close to Lauren’s impressive behind, this was too much. No question.

“Well, my ass is pumping!” she said enthusiastically, drawing the attention of a few onlookers completely unaware of what was going on.
“Did you have fun Joe? Please tell me!”

Within the tight crack, Joe couldn’t utter a word. Everything he said was muffled by the flesh, and his only means of communicating were weak little pounds with his tired arms. Lauren felt it, and with her self-serving bias took it to mean ‘Don’t ever stop.’ She wanted badly to believe Joe was loving this.

It was time for some cardio. Lauren would have felt remiss if she didn’t squeeze a run into her workout. Starting at a slow warm-up, Joe felt himself being pushed around back and forth by Lauren’s left and right butt cheeks again. Only this time it was far more aggressive. Even if things down Lauren’s pants were tight, there was a real shaking sensation about the whole thing. For Joe, it wasn’t all that different from being held in hand and waved around violently. It was disorienting. And that was just for the warm-up. As Lauren cranked up the speed she really got into a pumping stride. She loved to play with the speed of the treadmill, sometimes going on short intense sprints up to 8 MPH.

It wasn’t long before sweat started to build up in Lauren’s crack. It soaked into her underwear. It coated every spot of Joe’s body, mildly stinging his eyes and leaving a tangy taste in his mouth. If not for the fact that Lauren’s crack was tight and held him firmly in place he’d have been slipping everywhere. Instead, it was like being tied down and showered in sweat coming from every surface. It was all far too much for the tiny man. He tried his best to wriggle, to communicate to Lauren that he wanted it to end. There would be no relief, at least not by his own hand.

Lauren was huffing and puffing. She really put the effort into her exercise, but talked down to Joe all the same. “What… is wrong… Joe?! Haha…. You… you not…. having a…. nice time?” she teased, drawing in fast breaths between words. “Well… I only have…. 30… minutes…. To go… haha…”

Lauren kept that promise. As if squats weren’t enough, Joe had to endure being trapped down Lauren’s pants during that intense run. Luckily for Joe, the process of getting washed up actually offered more reward than he was really expecting. After taking him to the change room again, Lauren stripped down completely naked and showed off her gorgeous fit body to him. It was after this that Joe finally got a taste of taking a shower – giantess style! Lauren rubbed soap all over her body, and felt that Joe was dirty enough and in need of his own cleaning. It was only appropriate that she let Joe join her, to be in physical contact with her nude body while she cleaned the both of them up. Joe found himself rubbed against breasts, against butt, against pussy, belly. Lauren even gave Joe little kisses when she brought him up her face and scrubbed down. Joe thought to himself that maybe that workout was worth enduring. Maybe spending more time with Lauren wouldn’t be so bad. Not being able to predict or control her behavior was a major downside though.

As Lauren left the gym, Joe once again placed safely between her tits, she had a thought. This is too awesome not to share. She had to bring other people into the fold.
“Hey Joe! When was the last time you saw Holly?”

This would trigger many thoughts in Joe, many of them anxious and uncertain.