(It becomes clear, as he continues to work Tony open, that he is going to need the smaller plug. Tony may not be a beginner, but he's not ready for the sheer size of the one Obadiah chose.

Making the switch does not exactly require stealth. He just ensures that Tony is too - preoccupied to be paying attention to what Obadiah's free hand is doing.)

Eventually, he's got Tony as ready as he's going to get. With that accomplished, Obadiah withdraws his hand and turns his attention to the plug, making a show of slowly applying lube.