You heart Kat exiting her room. Her boobs became very active while she went down the stairs. You felt them jumping up and down, putting so much strain on you every time they came down. But you enjoyed it, you loved the weight they put on you when they came down and you loved flying with them when they went up. Your enjoyment only lasted a few seconds however as Kat made her way to the kitchen. Uneventful minutes passed by while Kat was preparing some lunch. Her boobs were very still. Even though you loved their softness and warmth, you like it better when they were bouncing.
"You'll get plenty of bouncing in good time" Kat's thoughts echoed in your brain.
"I need it now!"
"Hmmm"
You could sense that she was thinking about something, but what was it. You could not tell.
"What is it?"
"I have a treat for you. Since you like bouncing boobs, you know which boobs bounce the most?"
"Ummm.. I dunno, girls who run a lot?"
"Haha yes, but that is not what I meant. I guess you will understand soon."
"I do not understand Kat! What are you talking about?"
"Just be patient, I'm busy"
You were silent for a few minutes when you realized that something was not right. Kat's boobs were stressing you out more than they should be. It was only a little bit more though, they felt a tad bit heavier maybe. You dismissed it though, thinking that it must be your imagination.
Kat left the food cooking, she headed to the hall and sat herself on the couch watching TV while the food cooked. Her boobs entertained you for a brief few moments while she walked the distance. You still felt that something was strange. Around 30 minutes later she stood up again to head for the kitchen. The sudden move sent her boobs flying up only to come down crashing on you. You felt their weight a lot more than before. It was strange, Kat's breasts felt like they were straining you more in every direction. They felt like they were stretching you. They felt bigger!
"Now you get it" You heard Kat's voice in your head again.
"You're making your boobs grow?"
"Yes. Bigger boobs bounce more hehe"
"Oh.. but wouldn't I need to be bigger as well?"
"I thought about that, but I decided you are better off staying this size. So you can really appreciate them hehe"
More time passed as Kat silently ate her lunch. You continued to feel her boobs getting bigger inside you. Stretching you out, slowly becoming heavier and heavier. It was slowly becoming harder to hold them up as their weight continued to increase. Your cups were soon not really big enough to completely cover them, they were flowing around you. You felt Kat taking off her shirt and putting it away.
"I like that shirt, don't wanna stretch it or ruin it hehe"
"What about me? Kat your boobs are becoming really big for me"
"Ha but you like it that way."
"No I... I... I like it.." What was wrong with your brain? this was a bad thing, whey were you loving this. You're a bra, why wouldn't you like it? You were made to hold girl boobs, the bigger and bouncier the better.
An hour later Kat's boobs stopped growing. By now they were many sizes above you. You could not fully handle how heavy they were anymore, they rested on you with much more weight than you can lift and actually forced you down. You could feel your strings being really stretched, but somehow holding. It must have something to do with Kat's spell, because any other bra would have snapped by now.
Kat went up the stairs heading to her room. Her boobs almost ripped you apart. You could feel pain rippling through your fabric body as they bounced heavily up and down. Every time her boobs came down it felt like a truck landed on you. Your strings would stretch out so much they became thin as a needle. You were really too small for boobs of that size, and Kat had grown her boobs quite a lot. In fact she probably could not button any of her old shirts now because her boobs wouldn't allow her.
"So, you ready for some real bouncing now?" Kat asked in your head.
"What do you mean?"
"Oh, I just thought it might be fun to see how you can handle me jump roping"
"Ju.. Jump Roping?" Sudden realization hit you that this could be bad, really bad. At their size Kat's boobs were not suitable for that kind of action, not without a really good sport bra.. or two.
"Quite bitching, here we go"
Before you even had time to reply. Kat's body went upwards in a jump. Her massive boobs followed suit a fraction of a second. They carried you with them like you were weightless, and came down on you such force that you wished you could scream. Even though they were soft and cuddly they still felt so heavy on you. They were already too heavy for you to begin with, now they felt ten times as heavy.
"one" Kat's voice came into your head as she finished her first jump. She jumped again and again without giving you a moment of rest. Her boobs were bouncing all over the place. You should have ripped from the first, but Kat's magic held you together for more. Jump after jump Kat's boobs came crashing you. Your legs felt like they were not there anymore, and your entire body hurt everywhere. Kat continued her torture though without remorse.
"10, 11, 12, 13" Her voice echoed into your head. The torture continued relentlessly as Kat did not pay thought to your torment with her boobs. "20, 21 ,22" By now her jumps were quite rhythmic, if you had a mouth you would have screamed every time she jumped. "40, 41, 42" Her playful voice continued to echo in your head. Her massive boobs were starting to sweat now, and due to how much they over-sized you, they completely soaked you. "70,71,72" You could feel your entire fabric in miserable conditions, completely worn out by this exercise, Kat's boobs continued to crash down on you with every jump. You could tell she was liking this, her nipples were pushing into your cups, which were ripped in many places by now, but still holding as Kat held them together with her magic. "98,99,100.. Oh my god.. I'm so tired" Finally Kat stopped, and not a moment too soon.
"Whoof, I need to exercise more. I'm soaking wet hehe" Kat said. Swiftly detaching you from her boobs. You felt yourself retreat to your original size after being stretched out by Kat's much bigger boobs now.
"Oh wow" Kat said. "You are in really bad shape hehe. I wonder.. Should I..."
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