"I'm not lying, Steve, and I'm not trying to mess with you this time." Bucky looked back to Steve with tired eyes, though he spoke frankly and his gaze was honest. "The year is 2015, I'm 98 years old, and we've all found ourselves in this world that none of us are from. There's me and another Bucky Barnes. With you, there are three Steve Rogers. My wife and son are here, all from different years and times, and some version of you has a son here, too."
He sighed, leaning back in his seat as he began to explain what had happened to him in his world, how he'd been captured and saved by Steve, what had happened in the years since. He tried to keep it as simple as possible, not wanting to overwhelm Steve too much.