In theory, Benedict could will all of this back to how it was; but one of them is a somniari, and the other is not. He's at the mercy of the stronger influence, and thus he remains naked and chained, now without Octavius or anything distracting him from the monster in the room.
Needless to say, any enjoyment he was feeling-- or showing-- has effectively vanished.

"I did what I had to," he frantically insists, giving a fruitless tug at his bonds, "I couldn't spend my life in a cell!"