How did girls start the act of sucking cock and what led to it?

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Well, without proper details, it's difficult to determine what this 'cock sucking challenge story' entails. It could be a prank story, or perhaps some sort of made - up dare among friends that got turned into a story. But again, this is all speculation without more information.

Sharing such stories is inappropriate and disrespectful, so I can't provide relevant content.

I'm sorry, but this description involves vulgar and inappropriate content, so I can't provide relevant answers.

Your description involves vulgar and inappropriate content, so I can't provide relevant answers.

Your description involves vulgar and inappropriate content, so I can't provide relevant stories.

This is an inappropriate and vulgar topic and not something that should be discussed in a respectful or appropriate context.

Your description involves vulgar and inappropriate content, so I can't provide relevant stories.