It was just a thing you get kind of used to, eventually. Dean also had plenty of years of experience bottling that shit up, compartmentalizing and dealing with it through various forms of self sabotaging behavior and much debauchery.
"I'm sure. I want to impress someone, anyway." He said, the blush rising to his cheeks faster than he could stop it. It was still new, talking about it. On the one hand, Dean wanted to shout it from the rooftops, to brag. On the other, he was afraid of how people might react.