A/n: A really short one - TNT's idea. I'm watching HTTYD2 again today though, so hopefully more inspiration will come of it! (Sorry I didn't do the parrot thing properly, btw; I'll do it again after trystrike's idea.)
"I'm bored." Ruffnut complained, dangling off Barf and letting her arms dangle in the water.
"We just spent an hour doing tricks!" Hiccup yelled, staring at the twins. I thought they had a longer attention span than three seconds. Apparently not...
"Yeah, and now we're bored!" Tuffnut yelled back. "Aren't we, sis? Ruffnut?"
Ruffnut wasn't on Barf anymore. She couldn't have fallen though; her dragon would always dip down to catch her, no matter how annoying she or her brother had been. And they hadn't even been that annoying so far.
"Scauldy!" Tuffnut yelled, looking down into the water. Hiccup dangled over the edge of Toothless to find that, sure enough, the scauldron that they had once saved from a group of changewings was just under them in the water. And so was Ruffnut, grabbing onto the tidal class dragon's neck as it swam by.
Barf's eyes narrowed as he watched Ruffnut under the water. He jerked suddenly, sending both himself - Belch included - and Tuffnut into the sea. The other dragon riders watched on in confusion as the zippleback yanked RRuffnut back onto her rightful head and left the water.
"Hey!" she complained, glaring at the two heads, "I was having fun!" Below her, the scauldron grumbled his own agreement.
"Ha!" Hiccup laughed, "They're jealous!"
"What makes you think that?" Snotlout said doubtfully, squinting at the twins and their dragon.
"I don't know." Astrid responded sarcastically, "Maybe the whole fighting over them thing?"
"Huh, yeah..." Snotlout said in realisation. Astrid just face-palmed in irritation.
"Err, little help?" Ruffnut called, looking nervously between the two dragons. They were eyeing each other up now, clearly wanting to fight.
"Cool!" Tuffnut said, "A dragon fight!"
"Not cool," Hiccup corrected, jumping off Toothless and onto the scauldron's back, "Deadly. I'll calm everyone down, you two get on Toothless."
The twins complied with minimal grumbling, then Hiccup soothed the two dragons with calm words in Dragonese.
"Okay," he eventually called out to them, "You can get back on now."
"Thanks Hiccup!" Ruffnut said gratefully, landing neatly back on Barf. "Hey," she said to Scauldy as the riders prepared to move out, "I'll come see you soon!"