One-Shot: The Pact

So this is based on some Romione tidbit facts I found on a website. One of them states that down in the Chamber of Secrets, Ron and Hermione made a pact that they'd survive the Battle together, or not at all. This is how that pact came about. References made to Once Upon a Time 4x09 - "Fall" - and the 2003 live-action version of Peter Pan starring Jeremy Sumpter.