Scott struggled to focus on his schoolwork the entire day. During lunch he seemed somewhat absent. Socialising with Ethan and his other friends, but otherwise doing the bare minimum required to make it through without raising any suspicions. His environment felt foreign for some strange reason, and he just couldn’t shake the image of Vicky’s grinning stare from earlier.

Before lunch ended, Scott ducked into one of the lesser used bathrooms. He had been feeling hot all day, and upon looking at himself in the mirror, he really did look kind of pale. Not wanting to spend another minute in school, and certainly not wanting to risk facing Jackie and Vicky again, he decided it would be best to just make his way home.

Pulling Ethan aside for a moment, “Hey man, I’m not feeling too hot today. I think I’m gonna head home now.” Scott said. His tone was dull and solemn, and Ethan could really see that his bigger friend really wasn’t in a headspace.

“Hey no worries, man.” Ethan replied, smiling at his friend, “I’m actually done for the day now, I can give you a ride home.”

Scott’s face lit up slightly. Usually he’d get a ride home with Jackie if Ethan wasn’t around, but finally their contrasting timetables played to his favour. He couldn’t ask Jackie for a ride home early, he’d never hear the end of it. And she was undoubtedly going to be with Vicky, who he wanted to avoid like the plague. “Thank you so much bro, I really owe you one!” Scott said, with a little bit more pep in his voice than before.

As the bell rang, and the hallways emptied, the pair made their way out the side entrance of their high school. Scott appreciated his friend’s discretion, as they quickly rushed to his car, having avoided bumping into anyone.

As Ethan’s car pulled up to Scott’s house, the pair said their goodbyes and Scott ran inside. As the door clicked shut behind him, he sprinted up the stairs and immediately headed into the bathroom.

He slumped his body down as he stared into the mirror, shakily holding the weight of his heavy torso as his palms pressed into the rim of the porcelain sink. The whites of his eyes held a reddish tinge and his skin was ashen. Maybe he really was sick.

Opening the cabinet the mirror was attached to, he plucked the thermometer that lay inside of it and stuck it under his tongue. After what felt like the longest minute of his life, Scott inspected the gauge. “101. Fuck!” he said aloud. The thermometer clattered into the bowl of the sink as he abandoned it and moved over to the scale.

Placing his feet on the glass surface, he impatiently awaited its calculation. He prayed with each passing second. Each attempt at reassurance only served to confirm what he feared most, and what Vicky had picked up on almost instantly. “160… That’s what? Four pounds since yesterday? Ah fuck please, no!” he choked at his own words, not wanting to believe they could be true.

He could feel his temperature rising almost simultaneously with his panic, cold beads of sweat began to run down his skin. His hair stood on end as shivers coursed over his body. He bursted out of the bathroom, and beelined towards his room.

As he shut the door behind him he leaned against it, the slightest bit of relief washing over him. At least he was in the one place he could feel totally at ease - his own room. Pushing his back against the door, he allowed his feet to slide away from him and he slowly descended onto the soft carpet below.

His mind raced. Images of Vicky’s grin as she realised what had happened, the fact that she’d undoubtedly tell Jackie about it… Ethan… The image of Ethan, barely reaching the height of the tall girl’s navel, being forced to look right into it if he wasn’t jerking his neck upwards to meet her gaze.

Had he really caught the virus? What did it mean for his life? How much would he shrink? It all terrified him, especially considering his existing relationship with Jackie. He had no doubt in his mind that she would relish in returning the favour for his years of torment towards her. Yet a small part of him, a part of him he was too scared to admit existed, couldn’t help but be intrigued by it all.

In spite of having felt so unwell, he couldn’t shake the warmth in his loins from thinking about it all. As he climbed to his feet and made his way over to his bed, his hand drifted downwards towards the waist of his pants. Sliding them off, he allowed his hands to wander over across his genitals. His testicles tingled with delight at the soft sensation of his touch. He couldn’t help himself, so he quickly climbed into bed once declothed and went to town on himself. After his fourth bout of shamefully masturbating to the concept to the thought of being dominated by taller girls, he eventfully passed out

*******************************************

“Scott! Where are you, Scott?” Jackie’s voice boomed. Scott stirred awake, still not quite there until he heard his stepsister’s thundering steps as she raced upstairs. Panicking, the slightly dazed teen scrambled from his bed, managing only to stumble to the floor as he attempted to walk on weakened legs.

“Scott!” she shouted as she opened his door without knocking, “You okay big bro?”

He climbed to his feet as the door swung open directly in front of him. Before him stood an unfamiliar sight of Jackie. Previously he had towered over her, but now he found himself at eye level with her belly button. He didn’t even come up to the bottom of her huge tits. “Holy fuck, you’re small!” she said, aghast that Vicky had been correct. She made her way towards him, sensing the fear deep inside of him as she did.

“J… j… just leave me alone, please!” he stuttered, his tone almost affirmative, but layered with fear and concern for his own well-being.

“Or what?” she countered, taking another step forward and closing the gap between them. He craned his neck up and stared back, in an attempt to stand his ground. She continued, pushing her hand into his shoulder and causing him to stumble back, “What are you gonna do?”

As Scott regained his footing, he glared angrily at her, “Get away from me, you giant, fat bitch!”

Jackie’s blood boiled. Without even a second thought, she grabbed him by the shoulders and pulled him towards her as she  raised her knee, slamming it directly into Scott’s sternum. He keeled over in excruciating pain, wailing as he crashed into the floor - his arms tightly clutching his chest.

“Serves you right! I swear to God if you call me fat again, I will beat the ever loving shit out of you! Do you hear me?!” Jackie shouted, her fists clenched in anger as she towered over him.

Scott gasped in pained breaths as he struggled to regain even the ability to inhale properly. The pain he felt from Jackie’s strike was like nothing he ever felt before. Tears streamed down his face as he looked up at her pleadingly. The sight before him shook him to his core. He had never felt so vulnerable as his stepsister looked down on him. “I’m sorry!” he cried, feeling weak and humiliated.

Jackie pondered the situation for a moment, watching the brother who had tormented her so much curled on the floor. “Okay, get up. I wanna see something.” she demanded coldly, allowing him little time to recover.

As Scott climbed to his feet, she pulled a fabric tape measure out from her back pocket and bent over to place it beneath his foot. Holding it to the top of his head, she checked his height, “Four feet already, wow!”

Scott felt a sharp pain in his chest upon hearing her words. He had known he was short from the fact he was now face to face with her toned stomach, her bellybutton at near perfect eye level. However, he didn’t think he was quite that short. It was all too real now. He had been in denial for only so long before the reality arrived, and it was all too painful.

She held the tape across his body and measured the width of his chest. “Damn twenty six inches! I knew you were always a bit on the skinny side but that’s crazy!” she said, aghast at her findings. She relished in watching as Scott kept his chin down and eyes staring into one spot on the floor between them, saddened by each following measurement.

She mused, “I could probably fit my hand around your entire bicep now,” grabbing his wrist tightly and holding it over his head. Scott struggled in her grasp, feeling the upwards tug slowly starting to lift him as he tried his best to stay balanced.

Releasing him, Scott looked up at his sister and saw her eyes grow slightly more menacing for a moment. She reached towards him once more with her right hand, pointing out, “In fact, I think I could fit both around your neck!”

Scott’s eyes widened, and he tried to turn to run. But before he could even face away from her, both hands clasped together around his neck. He choked for air as they grew tighter and tighter, unable to even speak. Once more, she tugged upwards and Scott’s toes strained to keep himself upright as so much of his weight was held on only the very edges. “P… Please!” he squeezed out, using the remainder of the air he had as his face reddened and the veins in his head bulged.

And with that, she released him, watching as he crashed to the floor once again. Pouting slightly, she said, “Aww, you’re shivering! This shrinking is really taking its toll on you. How’s a nice cuddle with little sis sound?” A smirk curled upon her face as she spoke.

She reached down and plucked him up from the ground, only to wrap her arms around him and embrace him in a full body bear hug. Holding him tight against her, she lifted him from the ground, feeling his face get buried into her generous breasts. “Mmpphh, mmph, please! Can’t… Breathe!” Scott begged, flailing his arms and legs frantically as he tried to push away from his stepsister’s marshmallow hell.

“God, you’re so fragile!” she remarked as she carried him over to the mirror, swinging his small frame side to side with each step. Continuing, she remarked, “But you’re SO much cuter like this! And to think, this is only the beginning! Just imagine all the things we can do together now! There’s just so many exciting new ways we can spend time together, I’m not even sure where to start!” She couldn’t help but admire the difference in their sizes, constantly sizing him up in any way she could. “I’m so glad that we’ve managed to improve our relationship, aren’t you?” she questioned, watching in the mirror as Scott struggled to push away from her enough to respond.

“Mmph… Y… Yes, Jackie!” he stuttered back, her skin engulfing him so much that it almost made a complete, and constant, seal over his mouth.

She squeezed him affectionately, only serving to force more air from his already compressed lungs. “You like cuddling with little sis, don’tcha BIG bro?!” she asked, her gaze never leaving their reflection.

In spite of how untrue that was, not wanting to anger her again, Scott simply resigned to obeying her for now. Replying with his mouth still half against her, he managed to push out a succinct, “Yes, J… Jackie…”

As the two fleshy mounds pressed against him, Scott could feel the slight protrusions that he figured were her nipples pressing against him. The longer she kept him there, and the more he struggled, seemed to be causing them to harden more and more until they sharply poked at him.

Was she getting turned on by this? He wondered. He hoped not. He was already struggling to cope with her simply tormenting him, and he knew he couldn’t handle another beating. But Jackie being aroused by the control she exhibited over him? That was a whole different ball game. He was only four feet tall now, but this was only his first day of shrinking. God knows what she’d do as he got smaller.

Jackie laughed, dropping him down to the floor below, “Yeah, I bet you do!” As Scott climbed back to his feet, she hip checked him, causing him to slam down to the floor again. “A little perv like you loves cuddling his little sis, huh?” she said, belittling him as he struggled to his feet once again.

Holding a finger to her chin, she thought for a moment. “Hmm, maybe when you’re a bit smaller I’ll keep you as my little human teddy bear… But only if you’re really good! What do you think of that?” she asked as she closed the small gap between them, forcing him to crane his neck up towards her in order to make eye contact.

Too terrified to refuse, Scott stuttered back, “Y… Yes sis… Th… That w… would be nice.”

“I must warn you though, I’ve been known to drool in my sleep. Plus, I run hot and can get a tad sweaty. But I’m sure you wouldn’t mind. Anything for some quality time with little sis, isn’t that right?” she said, grinning at him. Contrastingly, his face showed only sheer terror, and Jackie was loving every second of it. She continued, “Now c’mere and give me a hug!”

Jackie wrapped her arms around her brother, more lovingly this time, and enjoyed the feeling of him clasping his arms around her ass as he tried to hug her back. “Alright, I’ll see you soon big bro! Hope you start feeling better, there’s so much for us to do!” she said. Before she released him, she reached down towards his ass and gave it a tight pinch - causing him to yelp out in pain.

She chuckled as she released him and headed towards his bedroom door. Saying nothing else, she opened the door and stepped out into the hallway. As she pulled the door shut behind her, she winked at him deviously, sending a shiver down his spine.

Riddled with anxiety and confusion, Scott immediately climbed back into bed and pulled the covers over himself. His body was tense and his mind frazzled, but the stress and strain he had been put under caused him to pass out once more without much trouble.

As Jackie made her way into her own bedroom, her mind raced with ideas. She was immensely turned on by their exchange, and couldn’t wait to use him some more. Shutting her door behind her, she wasted no time in slipping her hand beneath her waistband and nestling it atop her already soaked lips. A low moan escaped her mouth as she gently rubbed her fingers over her generous bush and into her folds.

Climbing onto her bed, she lay on her back and sunk into the soft sheets. As she fantasised about what she would do with her now shrunken brother, she began to vigorously masturbate. The ideas, and the reality of them, made her hornier than any porn ever had. Jackie continued to masurbate into the wee hours of the night, imagining her stepbro at all sorts of sizes and in all sorts of scenarios, soaking herself and her sheets.