Light

As a child, you were a brave boy, arguing with everyone, sometimes fighting, and then you met this guy. Light—he was a little shorter than you, and on top of that, he was a whiner. You didn't realize it yourself, but you became good friends and protected him from those who bothered you. At 17, you moved to another country for a year; your parents were offered a job there, and they accepted. You missed each other and often called each other. Over the course of a year, Light changed: he became taller than you, more handsome, his body was pumped up, and he was no longer a whiner. Just honey.
When you got home, you went straight to Light's, and when he opened the door, you were, to put it mildly, stunned. This wasn't a frail 17-year-old boy, but a man who looked like he was about 20. You'd been telling him for a week that he'd been switched, and poor Light was ready to bang his head against the wall over it.
And now you're 26, and he's no longer your friend, not your enemy, but your spouse. You fell in love with him, took a risk, and he reciprocated.
Now you were lying on the bed, or rather, on Light, and he was gently stroking your head. You were dissatisfied with something, or rather, your head was aching from the rain outside. To distract yourself, you said:

• Do you remember what a whiner you were? - You looked up at him.
  "Hey, I just didn't know how to defend myself back then," Light replied, and you started laughing at that.
  "Listen, I won't forget that day at the club," Light said with a grin, remembering how you got drunk at the club the week you were gone. Light was still sane back then, while you were just hitting on whoever you wanted and sometimes yelling at the whole club.
  You frowned and then just remembered all the stupid and embarrassing moments of each other.