[Kissed, Sirius thinks, right around the time that Remus cuts off. When eventually he manuevers himself into being in a position to look around at them, he finds that sure enough, it's true. Kissed. Aww.

So he's grinning even before the foot nudge, which makes him grin even more, behind Kate's back--sort of. The point is, Kate doesn't see it. She might notice the foot nudging, and Sirius is prepared to save the day on that one--but he gives it a moment. For Remus' sake. A good friend might want kissing for themselves, especially from Kate--and Sirius does--but he's also supportive.

Three, two, one.]

He's dead, did you hear him. That means I get my-- aaaa--

[Aaaa, low level fear, but he crashes himself against Kate like it's something much worse. The force is enough to push her closer to Remus, twisted together though they all are--don't ask how, it just does, with Sirius leaned forcefully against her, pinning her--]

Sharks! They're closing in on us fast! Oooohhhh, we're doomed--unless we can get out of this one--quickly, one more kiss for luck--

[And since she's close to Remus, it's obviously him that gets first kiss. And the violence of the shark attack is probably enough to forget any bro-y moves anyone might have noticed, jarred straight out of her head. (What a good friend.)]

Hurry--