But that night, things change.
You'd gotten used to your chest just kind of doing it's own thing and growing without any care of how you felt about it. Most of the time, you were fine with it - it certainly brought you a lot of attention at school. Both guys and girls would occasionally just stop and stare at you as you walked by. Even teachers, sometimes, though that usually made you feel kinda gross. Personally, you would've preferred it if your chest was smaller than it was - as it was, it was hard to find clothing that fit right and most bras her size were made for function, not fashion.
But at least the growth had been...semi gradual.
Until that night.
You woke up in the middle of the night with an odd tingling sensation in your chest. Worried that perhaps insects or something had gotten on your bed, you flick on the bedside light and sit up. To your relief, there's nothing there - but the tingling persists, and has started to grow stronger.
"What the hell?" you mutter, still blinking back sleep.
Then you feel a sensation of pressure, almost like you have to burp. Except it's coming from your chest. For a panicked moment, you worry that you're having a heart attack.
And then you feel it - the tingling intensifies, and your breasts begin to grow.
Mouth dropping open in surprise, you watch as they slowly begin to plump up - in a matter of moments, your D-cup bra is already starting to feel a bit tight.
"Uh...that's....uh...please stop?" you manage to ask faintly.
Your chest doesn't seem to care about what you want as it continues to expand, and now your bra is beginning to hurt from how tight it is.
"Shit!" you gasp, trying to remove it. But now it's so tight that you can't even get your fingers underneath the fabric.
SNAP!
The bra finally succumbs to the size of your chest and breaks, letting your chest flop down on your lap. Your eyes widen as you breasts, pulsing with bursts of growth, sits in your lap. Each breast is now easily the size of a basketball - and they continue to grow.
"Um!" you say. The tingling sensation intensifies again, and you let out a squeal of involuntary pleasure as your breasts continue their growth. You put your arms around them, trying to halt them, but it's to no avail - they grow and grow, until you can't even put your arms around them.
"Stop!" she cries.
But they continue to grow. Now so large that they're beginning to reach the edge of her bed frame. The weight of them has gotten intense enough that you know if you tried to stand, you'd immediately be yanked to the ground by the size of them. Your breasts are now a size so large that there isn't a letter of the alphabet that would adequately describe them.
"FUCKING STOP!" you finally shout.