[She caught that tightness, and immediately regretted her words. Jack had seemed fine talking about swimming in general, it never dawned on her that something like the temperature of the water would have an almost ironic effect on him.]

...hey, you know what? [The question came out a bit softer than before. Less teasing.] It's not too cold yet. We can hit up the beach this weekend if you want to go for one last swim for the season?