Siblings!

A James/Lily AU. Lily is Sirius' sister, and he's been telling the other Marauders about her for the year that they've known each other. What happens when they finally meet her, and does James keep his head? DISCLAIMER: NOT JKR, DIDN'T MAKE WRITEY BOOKS, DIDN'T TURN SAID WRITEY BOOKS INTO FILMS. SO THERE irregular updates