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1.
When a flat chested girl goes home over summer break, goes through puberty, and comes back to school with large breasts.

The girl will, usually, have been un-noticed by most of the guys in her class until this point. Hopefully, she won't let the attention go to her head, and ditch her old friends.
Don't let summer growths go to your head.

Words related to summer growth

breast development growth okay puberty summer