The first Wizarding War promises casualities and grief. Ariadne Lovegood struggles to hold onto her friends and family in the vicious storm, and she's worked her fingers to the bone keeping her grip. Sirius/OC.
James is the pirate Captain of The Marauder. Lily is the daughter of a Duke. The two strike up a contract and the next thing Lily knows, she's on a Pirate ship, with one of the deadliest pirates after her.
(This is my favorite)