Fearless and Elemental by Brigid Kemmerer

So! In addition to the main series, of which only two books are out, Kemmerer also wrote a couple of short background stories: Fearless and Elemental. Elemental is told from both Michael's (the older Merrick brother) and Emily Morgan's (the name probably won't ring a bell but if you read Storm, it will suffice to say that she's Tyler's sister) perspectives. It takes place several years before Storm, meaning that their parents are still alive. Fearless is about Hunter, taking place before he moves to the Merricks's area. Both give some nice background information on the two characters and are definitely worth a read. They are particularly interesting in where they both end. I won't spoil why but as long as you've read Storm, you should be able to make the connection. Anyway, they're both extremely short and shouldn't take longer to read than half an hour a piece. They're not essential to the story line but these little side stories are always pretty interesting.