It was just one of those things, he guessed.
In genuine honesty, he couldn't remember a single time in his life when he'd blushed.
It just didn't fit him. He was confident, arrogant, not easily embarrassed.
He'd made other people blush, of course. Plenty of times. But no-one had ever been able to do the same to him.
Not even Sirius, and that time he'd...
Well, best not to mention it. It was embarrassing. Very. Painful to speak of, in fact.
But at least he hadn't blushed.