Jim's expression softened. Not just sex. Kirk was... adapting. To this. To being beholden to someone else. And that didn't bother Jim at all--he had never felt that the right relationship was restrictive. Though the wrong one could be. And he wasn't talking about monogamy at all.

"I live in horror of Spock discovering that tactic," he sighed. And smiled. This was good. Companionable. And off.