Hermione Rheanan Potter: James Potter's Twin Sister

Hermione travels back in time after the final battle in order to prevent as many of the lost lives as possible. She ends up as James Potter's twin sister, Hermione Rheanan Potter, and has new powers which allow her to defeat Voldemort and preserve the Wizarding World. Eventually she will fall in love, but the question is: With who? Non-cannon, time travel, twins.