Call Him Captain
Aang wanted he and his friends to spend his seventeenth birthday on Ember Island so they did. On that night they sat around a fire on the beach. He and Katara leaned against a fallen tree, a cover thrown across them. On their left Ty Lee, Toph and Suki laughed and gossiped and across from them sat Sokka and Zuko.
"Hey!" Sokka called as he threw another log on the fire. Everyone looked at him "Hands where I can see 'em!" Katara cut her eyes at him and Aang made the flames flare ten feet in the air. The young women laughter as Sokka screeched and jumped back. He recovered his composure and said "I don't give a damn Mr. Avatar, just keep your mitts off my baby sister!"
He went and sat back down beside Zuko. "You really need to ease up on them. You know what they call you right?"
"Yep," the warrior said puffing his chest out "Captain Cock-Block. A title I wear with pride."
The Fire Lord shook his head "What a hypocrite."
"Call me what you want."
"You act like you and Suki didn't-" Zuko paused when his friend snapped him a hurt and hardened look "You act like you've never done anything sexual."
Sokka looked down "Yeah, and look how that turned out." he said sadly.
"You can't compare them to you. Just look at them."
The two men looked across the fire at the couple. Katara playfully turned her back to Aang, pulling the blanked away from him. He laughed and whispered something to her as he reached and tugged on the cover. She giggled over her shoulder as he grabbed a bigger handful of the blanket and pulled it and her into him and planted an over exaggerated kiss on her cheek.
"They're going to be together forever." Zuko went on "What are you going to do when they get married."
"Then I'll back off." Sokka shrugged "But until thin call me Captain."
Zuko groaned, closed his eyes and rolled his head back.