All Quiet on the Humor Front
There they stood, back to back, in the middle of the battleground. There was a momentary lapse in fighting, and they both were trying to catch their respective breaths. Leon listened for any sign of injury in Cloud's breathing. He was, of course, surprised when the blonde let out a chuckle.
"Dude, my sword is bigger than yours." Leon turned and gave him an incredulous look. They were here, fighting for their lives, and Cloud was making jokes. He felt his eyes narrow at the barely veiled innuendo. Turning away, he kept the scowl on his face. It deepened even more when Cloud's chuckling turned into outright guffawing. Leon turned back to him and stated tonelessly,
"It's not the size that matters, it all in how you use it." Leon could practically feel the surprise rolling of Cloud. Cloud turned away so the other man wouldn't see his blush. He didn't even realize Leon had a sense of humor, let alone the ability to make a joke. Leon smirked and swung himself back around. In their silence they could hear other sounds of battle. Leon looked down at his feet and kicked some dirt. It was his turn for a laugh. "You should see how I use my weapon." He didn't even give Cloud a chance to answer and launched himself into battle.
A/N: I'm sorry if you think "OMG!!! CLOUD/LEON WOULDN'T NEVER ACT LIKE THAT!!1" They are guys. In my experience, guys like to make dirty jokes. Cloud just didn't expect Leon to fire some back at him.