Looking for a story.

It's a story about a music/rock band of two groups. Girls and boys.

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I think there was competition going for the best music band and the girls leader was nervous because the boys band was too strong and good.

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Also the boys band leader was EX of the girls band leader.

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Before their performances they made a bet that if the girls won, they would get to kick him the balls.

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And at last the girls won... And they win the bet and fuck up his balls.

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Please help me find this story.