I am currently imagining all the scenarios that could lead to lots of bondage this year.

Sam gets badly hurt in the accident where he hits the dog and has to spend months in traction.
Amelia is actually something like Kathy Bates in Misery and decides to keep Sam trapped in her bedroom.
Sam is actually in a psych ward again.
Sam keeps trying to escape so Dean has to chain him to the car/bed.
The alpha vamp has been training Sam to be his perfect animal and keeping him on a leash.
...and so on and so forth :D