"Yeah," Harry said, glad Ginny had his hand because the urge to grab her backside was making his fingers twitch. He could smell the scent of flowers and fresh cut grass filling his senses and he ran his thumb over her palm in a way he usually did when they were lying in bed, post coital.
He seemed to be able to say very little besides "yeah" but he found words to further his body's only objective. "I need air."