Most women in Hayato's life have been very mean to him except for one who thought he was an 'unidentified mysterious animal", and she just kind of stalked him and would communicate in odd chirping noises and hand signals. They aren't so bad in Duplicity, but he's not met any that seem so oddly... delicate as Elizabeth does in this moment.

When she opens her mouth into the kiss, he slides his tongue in a gentle sweeping stroke, almost timid, then he sucks at her bottom lip and breaks the kiss to look at her.

"It's okay?" Part of him hopes she feels better, because he's never felt hotter.