Dean's moods were unstable and unpredictable and liable to change without notice. But for the moment he was calm, seemingly at peace. That didn't mean he was passive or stable, not by a long shot.
He shifted, leaning back first then forward. He put his body weight into a shift in position that would take Cas backward and onto his back with Dean pressed against him, hovering above if not holding him down. Hands groped at Cas' shirt, fingers pawed at the man's hair.