Subtlety: Flirting
Natasha Romanoff had a natural understanding of kinesthetics. No matter how her body was in motion, she knew its absolute and relative positioning at all times. It made her a prodigy as a child-ballerina; it kept her alive as an assassin and spy. So when the tip of her boot brushed his underneath the table, as they picked at shawarma and french fries, he knew it wasn't accidental.
He'd reply with a wry smirk if he had the strength. The slight dip of his head was enough. She understands the economy of motion of a trained sniper. He swears the phantom of a smile tugs at the corner of her mouth as she struggles to bring the wrap to her mouth for one more bite.
