Definitely not. Dean was a man of (usually) simple pleasures. This was a thousand miles off the reservation and way too sudden for him to even process. It was just easier not to think about. He was trying to just enjoy what was happening, even if Sam was inexperienced. He was still pretty damn good at it.
Giving Sam an annoyed look, he reached to flick his ear. "Shut up, you know I talk a lot when I'm on edge," he grumbled at him. He wasn't sure if it was good or bad that they could keep up brotherly banter with Sam in the process of sucking him off. Still, he grabbed the little bottle from under the mattress (he didn't want to know why Sam knew it was there) and handed it to him.