The Return of the Marauders

The Marauders try to make a potion that will cure Remus, but end up making one that will send them, Snape and Lily to the w the Marauders shall join Harry Potter and Cedric Diggory in the Hogwarts Tri-Wizard Tournament! And Dumbledore is having older Sirius pretend to be Harry's pet dog. How will this turn out?Dursley Abuse!Family/Friendship/Hurt/Comfort and a bit of Humor