Billy considered it for a moment. There was plenty of space, of course letting her in was logical! And if they were in the water, she wouldn't see much of him. Besides, if he remembered correctly, she had a boyfriend---or something.

"Sure, it'd be rude of me to hog it all. The temperature's just fine."

He silently thanked his luck that she hadn't just made a cannonball and startled him even more.