Updated out of sequence because this idea popped into my head--and I couldn't resist going for the "Lick" prompt before moving on to others.

Lick

"I think I will definitely be having a frozen, creamy treat today." Sokka said, licking his lips as the vendor handed him his chocolate ice cream.

"What did you call this again Zuko?" Asked Katara, eying her vanilla flavored treat warily.

"It's ice cream." Zuko said with a smile. "It was my favorite treat when I was young. My mother used to get me the kind that you have Katara, only sometimes I'd get slices of mango on it." He informed his waterbending friend as he took his cup of vanilla ice cream from the vendor.

"Ohhh, they have custard flavor!" Aang exclaimed. And immediately requested that.

"Just get me whatever looks good twinkletoes. I'll trust your judgment."

"Leave it to me Toph." Aang reassured her.

"So, that's one custard in a cone and…how about, a rocky road in a cone as well?"

"Sure thing. Here you go Avatar." The vendor said with a smile as he handed Aang the two cones. Aang offered Toph hers and she took a greedy lick.

"Mmmmm, Aang, I should ask you to pick out stuff that I can't see more often. This is great!"

The whole group sat down on a bench to enjoy their treats. Zuko noted that Katara had yet to try hers though.

"Katara, what's stopping you? It's good, I promise."

"Well, alright. I wish I had asked for a cup though. This looks a bit messy." She took one tentative lick of the ice cream. A smile immediately spread across her face. And she began to lick it with more vigor. Running her tongue from the bottom of the mound of ice cream all the way to the top of it, and then in little circles around the peak of its dome. She was filled with such rapture, that she didn't notice Zuko freeze up at her behavior.

Zuko's eyes widened, his eyes fixed on Katara's mouth as she ate her ice cream. Some very ungentlemanly ideas began to creep into his mind, and he felt himself heat up even more then could be accounted for by the rays of the summer sun overhead.

"Stop!" Zuko yelled abruptly, catching Katara mid-lick. She drew her face away from the cone.

"What?" She asked, completely taken aback. Everyone else turned toward Zuko, puzzled.

"Just don't…I mean…" Zuko stopped and pinched the bridge of his nose, frustrated at his reaction.

"Here, let's switch. You're right; the cone is a bit messy. I have more experience with it. You can have the cup."

"Oh, thanks Zuko!" Katara said, and immediately started on the cup of ice cream.

Sokka gave Zuko a suspicious look though. "Alright Mr. Fire Lord, we're going to have a talk." Zuko's face fell.

"But, Sokka, certainly there's no reason to…?"

"No buts buddy." Sokka said as he dragged Zuko over to the other side of the vendor's truck where the others wouldn't be able to hear or see the two of them.

"What's up with them?" Asked Katara.

"I'm sure I have no idea." Toph said as she broke out into laughter.