Stefan moves to submerge her again, but stops when she asks for a truce. He pretends to think about it, as if the mere notion is something that requires a great deal of thought, before shrugging and sighing like this 'truce' is going to take a great deal of unnecessary effort. "I suppose if you insist."

And while he could yell out 'psych' and dunk her again, and the thought does cross his mind, he refrains. Instead, his arms move to wrap about her form to pull her towards and against him in the water. "See, we can be normal. Average teenager's not so bad, is it?"