Dean's fought the good fight with the hope for peace when he is done. Sam's fought and failed with the hope that someday, finally, he might just be done.

Fifteen year-old Sammy Winchester has never been the most valued member of his family - John is strong, Dean is cool, and Sammy... is just sort of there, a tag-along. But all that changes when he's needed to play bait on a dangerous winter hunt.M for lang

Dean's life was just his, and it was time to start living it because, really, it was the happily ever after that mattered and that was the only part that wasn’t written yet.