Oyyyy. [He laughs, something of a sputter in the water, in reply to that with a wicked grin. This is the kind of banter he likes - the kind that keeps him busy as he tries to swim, keeps him from obsessing over ensuring she's still by him with every stroke. And then it's also just a nice mental image to consider.]
If that's the case, you probably like it doggy style, don't 'cha.