"The toast is burning."
Natasha watched his mouth move. God, he had such a beautiful mouth. Which was odd because his lips weren't full or bowed like hers. They were thinner, harder and capable of such cruelty. In fact, she wasn't entirely sure why she thought his mouth was so lovely. She tilted her head and narrowed her eyes trying to decide why she thought this fact was true. It was probably a combination of the perfect amount of lines fanning out from the edges of his mouth, combined with the almost imperceptible movements when he was thinking. And that sexy little scar.
David rarely spoke unless he had something important to say and when he wasn't speaking his mouth remained immobile unless he was looking at Natasha. She was one of the few people that could draw emotion from him. Hmm, now that she thought about it, she was pretty sure she was the only person that drew emotion from him.
Oh, his mouth was moving!
"Natasha!" he said sharply, "The toast is burning!"