Petunia's Secret

What if Petunia had a secret? How would everyone react? Petunia has been hiding a secret from everyone, you see, she's not who we all thought she was. What if she was already married to someone else long before she met Vernon Dursley? And what dose all of this have to do with Severus Snape? Could it be that she was a Muggle-born witch herself? Read and Review!