[Anon's a little past words at this point, leaning forward when Natsuno makes that small and deliberate movement -- there's a sparking split-second where he catches his eye again, hungry and considering, before he actually does just pounce. It's not quite a lunge; he still manages to control his momentum somewhat, because they're still so close that he really only needs to shift a little.

But his breath is hot and quick in the midst of the onsen air and everything else for the barest of instants before he makes contact, and then his tongue is hotter when he licks up the drops and trails of water along Natsuno's collarbone and the tendon in his neck before biting down. Once, twice, deeper and lighter pressures like he's taste testing, searching out the pulse and soothing with a kiss or two in between. The last time he holds on a little with his teeth, almost thoughtfully, like a predator debating whether to tear out the throat -- closes his lips around the bite to suck briefly at it like a deeper kiss.

(And as deliberate and exploratory as all his motions manage to be, his focus almost intense enough to be something physical on its own, the thinnest layer of water and skin between them means that the galloping of his pulse comes through too; it thrums along with only a couple of stutters, whenever he actually bites down.

It's an easy but amazing motion, when he knows what Natsuno is.)]