I Melted Wax To Fix My Wings

After four torturous months Sam has his brother back, but Dean is accompanied by an angel with a terrible task for them both: help stop the impending apocalypse, or see the world destroyed. Sam has no idea what to do next when the Trickster turns up, blonde and female this time but as maddening as ever, promising assistance.
As time passes Sam finds himself slowly coming to depend on the pagan Trickster god, but just when it looks like the apocalypse can be averted, the Winchester luck kicks in and threatens to ruin everything - including Sam's friendship with Loki.