Water Just as Thick as Blood (Harry Potter)

Lady Luck seems to have taken a morbid curiosity to the Potter twins as their fourth years at Hogwarts approaches.
Various x oc?
Whether or not relationships are platonic or romantic, they will be fleshed out.
Editing? Canon? Hah! I scoff at your audacity. Story will pick up after the first few chapters when characters are actually introduced. Additionally, flashbacks to other years will be sprinkled in.