Ciel casually kicked in the water, feeling it resist him and watched the man. He was confident he wasn't going to drown in surprise at least and kept watching him, even as he questioned the teen.

"Your eyes. Anyone who knows people, knows how a person smiles without smiling. Might as well just smile. You can always lie about the why, if that's a problem." He gave a little shrug.

As for the suit, it kept him covered. Which is very much preferred compared to the swim trunks ever other man favored.