Howard was a man who wasn't used to being anything other than quick witted, but Peggy's answer clearly threw him off for several seconds. It was the flush more than the words, as if she had a secret. Was she...?
No. No. Nope. Never. If he had done something and made Peggy Carter fall in love with him, his life as he knew it would be over. Because he was confident in all ways, including the knowledge that he would never survive a serious relationship with the woman in front of him. He loved her... Dearly. Like a sister, which was probably inappropriate considering how many times he'd imagined her naked over the years but still.
But then she smirked. And she laughed. And after one terrifying moment in which his life flashed before his eyes, Howard could breathe again. He pressed a hand to his heart, looking a little green around the gills.
"Jesus Christ, Carter, don't do that. You scared the shit out of me."