Dean was exhausted. Both physically and mentally after taking a solo hunting trip.

Why solo? Because he needed some time away from the bunker since the Mark was acting up and he believed handling it on his own was the best idea. It wasn't.

He finally made it back home after about a month of being apart. Sam seemed to be outside.

Dean popped himself open a bottle of beer, taking a long swing from it with a sigh.

It felt good to be back.

He thought he was alone when he heard footsteps approaching.