Red Rat Turned Green

What if Peter was put in Slytherin? What if the fourth marauder was a girl? Will that make it easier for James to get Lily, or harder? And will they survive? James/Lily Remus/OC Sirius/OC OC/OC Check Profile for more information. NB: This is not about Peter; it's about the repercussions of taking him out of the equation.