[His tenseness makes her tense. Really, she's aiming for the opposite. So, while she doesn't push his hand any further, she does lightly run over fingers over the back of his knuckles beneath the water.]

We're naked, sharing a bath together. I think it's safe to say you can touch me where you'd like, Killian. [Because she knows he's imagined it at one point or another.] It's okay.