Evidence I
"Hey Aang! Think fast!" Aang turned around and ZOOM! A football flew right by his head. "Dude! You're supposed to catch it!" Sokka whined.
"S-sorry." Aang kept walking, ignoring the football on the ground
"Hey, wait up!" Sokka jogged after him, grabbing his ball. "Where have you been lately?."
"Around." Aang looked like he was in a hurry.
"Around? That's it? Seriously, what's been happening. We haven't seen each other in weeks."
"Oh, you know. High school. Homework. I'm busy." He didn't even look Sokka in his eyes.
"Well…are you doing anything to-"
"Yep. Sorry. But I'm running late."
"…late for what?"
"Just…this thing I gotta do."
"Are you doing anything tomorrow?"
"Yeah, I think so."
"Come on buddy, what about the weekend? We haven't hung out in so long…"
"I know man, I know. I'm sorry, but I've been preoccupied." He started to turn the corner.
"Where are you going? Your home's the other way. Right?" Sokka pointed in the other direction.
"I told you. I gotta do this thing. I'll see you tomorrow."
"Tomorrow? Yeah, okay." Sokka grumbled. "That's what he said last time too."
Sokka got home late. Katara was sitting at their kitchen table, studying for college.
"You don't look so good." She said. Sokka's shoulders were slouched and his frown was long.
"I saw Aang today."
"Wow, bout time. He's been AWOL for almost three weeks. Where has he been?"
"I asked him. He said that he's 'been busy'. Like I haven't heard that one before. I remember you used that same excuse last year."
"What? When did I use…" Katara stopped. "…oh." She remembered saying 'she was busy' when she wanted to sneak around with Zuko. "Oh!"
"What?"
"I think…I think I know what Aang has been doing."
"…okay. What then?"
"Think about it Sokka. He's seventeen…Toph hasn't been hanging out as much either…those two spend all of their time together…and…do I need to say more?"
Sokka paused. "Are you…saying that…Aang and Toph…"
"Yeah." Katara smiled. "I think so."
"They are under alien mind control!"
"Sokka, shut up."