When Connor was around 5 or 6, his best friend was Troye Mellet. They were inseparable, and therefore they were in both in the car during the accident. The accident that sent Troye into a coma, killed his mom, and left Connor alive and unharmed.
Only that isn't the kind of thing a 5 year old could understand. So Troye became an imaginary friend, and the accident became a nightmare that never did or would happen.
Eight years later, Connor was forced to remember.
Eight years later, the world fell apart and Troye was at the center of the disaster.
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Told in the two siblings' perspective, this is the story of when a best friend dies in your mind, then wakes up. Spanning over a few years, it shows the evolution from imaginary friend, to best friend, to discovering yourself, and falling in love.
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Two parts, about 20-ish chapters each. Alternating POVs.
That summary was awful. Hopefully the story will be better.