Boring. If he had to sum up his feelings these days into one word, John would have to pick that one. Just over two years into the trip, and he felt like there was little else left to do. He had already managed to make all the visits to the various worlds he cared to, and there is only so long you can play a maxed out character in an MMORPG before it gets tedious, even if it was the best game ever. Even the insanity that was his ecto-sis’s dog habits had died down, as she had managed to gain at least some control over herself.

Still, he had managed to keep himself entertained without doing something completely crazy; at least, not after Jade shrank him and locked him in a drawer for a week because of that prank with the mashed potatoes and the gazebo. Speaking of Jade, though he had managed she was apparently having a harder time of it, which had ultimately led to the current predicament.

“Are you sure this is perfectly safe?” John fidgeted nervously. “I mean, you’ve never tried something like this before on a person.”

“Oh it’ll be fine, I’ve changed peoples’ size loads of times, and this isn’t all that different.” She had somehow gotten it into her head over the past few months to start experimenting with her powers. Not just shrinking and making things bigger, but shrinking and making things bigger in new and interesting ways. The first thing she tried was to see if there was an upper limit for how small or big she could make something or someone, and, after getting them involved in a particularly disturbing war between bacteria on a salamander’s butt, she had gotten tired with that and wanted to try something new. Namely: can she change the size of parts of things, without changing the rest? Initial tests proved successful, and now she wanted to try it with a living test subject.

“But why does it have to be me?” he said as he stood a dozen or so feet from her, in his designated spot for the experiment.

“Because of the gazebo John.” With that, she began to glow with the telltale green sign of her using her spacy powers. “Wait, you’re still mad about that?” John cried, as he started to feel something strange happen to his legs as they too started to glow. Surprisingly they didn’t just get bigger, as expected, but rather simply grew longer until eventually he reached a full eight feet in height.

“I can’t believe that actually worked.” John exclaimed, realizing that he was now far taller that anyone he had ever seen. “I told you I knew what I was doing.” With a smile Jade began the work of reverting him back to his original height. “Well, what’s next?”

“I don’t know, I guess that’s it.” She replied, a little disappointed that nothing had gone wrong. Oh, not that she want anything bad to happen to him, it’s just that now she couldn’t think of anything else to do, and she was worried that she would have to face boredom once again.

With that though, John had a curious thought that he just had to bring up, “have you ever tried to use your powers on yourself?”

This was a surprising idea, as she had never considered doing that; not much point to making yourself bigger if you can just make everything else smaller just as easily. “Well no, but what would I change?”

Then it hit her. Although she was no longer a child, she didn’t look like it. At fifteen she had not managed to develop any of the beautiful attributes she had seen in her grandpa’s hidden stash of magazines (her first exposure to what a grown woman should look like, though it still confused her as to why he had taken the time to color every single one of them blue). She was basically the female equivalent of a twig. In fact, what she considered the most important sign of her approach to womanhood had yet to grow at all, leaving a completely flat chest.

“Wait, I just though of something.” She smiled mischievously. Maybe now she could become as much of a woman as she wants, and she didn’t care that her brother was there to watch.

She started with her hips, and moved on to other parts of her body; slowly adding the curves she had always wanted, relishing in her developing hourglass figure that started to show under her godtier outfit. By the time he realized that she was going for something more than just simple and fun, she had already become very sexy, and it didn’t look like she was going to stop anytime soon.

Now it was time for the main event, and Jade couldn’t wait to see how big she could make them. “Hey John,” she teased “watch this.” Her chest then started to glow; and then it started to grow.

“How does it feel?” John asked dumbfounded, his attention drawn to this new development. “A little tingly, but really nice.” However as they grew and her clothing stretched to contain them, Jade began to feel something more than just a tingling sensation.

Heat. If she had to describe it in one word, this feeling would be heat. A burning sensation of pleasure that started small, but quickly grew the larger her bust did. It demanded that she explore her new attributes even as they continued to grow, a demand she quickly obeyed with enthusiasm. “Wow it feels so good. I want to grow even more!”

First apples, then cantaloups, and now she was slowly exceeding watermelons and beyond. They were growing so large, that Jade’s clothing was starting to stretch itself tightly over her new curves, giving an arousing sense of compression that perked her nipples as stiff as diamonds, something that her sibling had difficulty not staring at intensely.

“Jade, you look like you’re about to pop, maybe you should quit now.” Though he was starting to worry, he didn’t quite manage to put much feeling into his suggestion. In fact, he wanted her to keep going almost as much as she did, and couldn’t help but keep staring at her expanding bosom with a growing sense of lust he could barely understand, and could only contain with the fact that she was his sister. “No, my boobies have to be bigger!”

Jade continued to fondle her breasts as they grew, squeezing and caressing, trying to satiate her desire. “Oh, oh yes! YES!” All that mattered to her was the growing sense of fullness in her chest, and the burning heat in her nether region. She only wished she had a third hand to take herself over the edge; she did not want to take her hands off her enormous boobies for even a second. Feeling close to the edge of bliss, she pored every ounce of her power into one last surge of growth, and reached as far as she could around her sexy mounds to pinch and squeeze her nipples, hoping to push herself over. “FUCK, YES!”

Her world went white, and for a moment all she could feel was the pleasure of release. Eventually she realized that she was screaming, pausing only to shout out yes, fuck, and other unintelligible words at random. As she started to come back down, these faded into soft moans while she lay on the floor, a small trickle under her skirt that belied the torrent it once was.

“Are you okay?” After taking a moment to recover herself from her climax, Jade started to raise shakily on unsteady legs. She knew he was worried, but she couldn’t help it; she wanted to feel like that even more, she wanted to touch her new talents over and over, as she exploded again and again. God, they were bigger than any beach ball she had ever seen! Then she saw that he was starting to hunch over noticeably. Perhaps she didn’t need another hand after all? “You know John, you just made me think of something we could do to to pass the time that’s even more fun.” She said with a smoldering look in her eyes, as she stepped towards him with a sway in her hips as well as her breasts that couldn’t help but arrest the eyes.

“What’s that?” In response, she grabbed his hands and sunk them deep into her meaty mountains “Oh, I think you can tell.” As he started to feel the yielding tit-flesh beneath his fingertips, he realized he could.