Finnick nods. Of course he trusts her that much. She's given him absolutely no reason not to. He can't imagine her taking advantage of him in any universe. Plus, he likes when she tells him what to do.

He watches her intently as she focuses on the magic, and then she starts speaking like... Well, he imagines this is what a siren sounds like, which turns him on in itself, because that's fucking cool.

He always said he'd let a siren kill him, so it's no surprise that her wiles work on him right away, his eyes lidding with the soothing sweetness of her voice.

The bit of hesitation and anxiety that would usually crop up from such a question is much smaller now, and he only hesitates half a second before responding.

"Behind my back, please... Elbows clasped."