Mermaids & Marauders: Since You've Been Gone

Katie is back at Hogwarts. As Care for magical creatures teacher. She is still after all these years heartbroken about her best friends James and Lily Potter who died nearly 13 years ago. One of her best friends was send to Azkaban and then escaped and is going after her godson Harry Potter. Which is one of the reasons why she returns to Hogwarts. Harry doesn't know that she is her godmother yet. When she meets Severus Snape again, will there be renewed sparks? Or will old hate still be a problem. Can they put aside there differences to protect the people they love.