Bound in chains- A futuristic warning

What if one day, four children that looked like levy and lucy, were found in a dark guild. where Lucy levy and gajeel were there to take down 3 dark guilds . while taking down the third one lucy uses her wolf slayer magic which allows her to transform half way or fully into a giant silver wolf it's not her only magic. when she hears crying while in the form she begins to lose control of her magic and soon decreases the guild. what if they were sent from the future what if these kids were Lucy and levy's BIological children and only lucy and Gajeel notice immediately. what were they sent away from and what could have followed them though? what do lucy and Levy hide in their past what haven't they told the guild?