Fics like Miniature Footprints

A mission gone wrong leads to the de-aging of Peter. The Guardians, totally incapable of childcare, leave Peter with Yondu while they look for a solution to their problem. Unknown to the rest of them, Peter's brain is perfectly fine. He remembers every little detail of what's happened, but has not told the others that his grown-up brain is trapped inside his shrunken body. He uses this to his advantage to cause mayhem.

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