Hiccup was officially getting annoyed. His waterproof leg was still being a bitch to deal with. Not to mention it just made his leg hurt like crazy because of it not being well fitted.
He decided to keep it to himself for fear his friends would miss out on swimming to make him feel better. While they all splashed and played in the water with no problem, he was wincing in pain and getting sick from the feeling. He did his best to play it off but Jack finally started noticing how pale Hiccup was getting. He was treading water and looking pained from the struggle.
He swam over to Hiccup who was doing his best to kick the water and not be dragged out.
"You okay?" Jack asked when he reached Hiccup.
"Yeah, fine." Hiccup said quickly.
"Hiccup you look terrible, come on, let's go." Jack said, taking Hiccup's arm carefully.
Hiccup managed to reach the sand at the bottom, but once the prosthetic leg hit the sand, it sent a shooting pain up his entire leg and he actually cried out. The waves were starting to get rough and he was getting scared.
"I got you Hiccup, it's okay." Jack said, getting scared.
Hiccup barely heard him as the pain was unbearable. He was seeing spots dance before him and he wanted to vomit.
Jack dragged him carefully and when he could see Hiccup's leg he could see how purple and swollen it was becoming.
"Crap!" Jack shouted as he dove under the water to try and take off the leg. Hiccup was slipping slowly into unconsciousness so he needed to get the thing off of him. They were still too far from land.
Hiccup leaned onto Jack's back who was still underwater trying to figure out how to get the damn leg off.
Jack managed to finally get it off and swam up quickly to catch Hiccup and drag him towards land before he went under. The prosthetic leg floated away and Jack could care less.
He got Hiccup to land and helped him hobble to their towel.
He suddenly heard someone screaming and looked around to see kids and parents staring in horror at Hiccup's leg. Jack looked down and cringed. From all the tugging and pulling he did underwater he'd caused some bleeding on Hiccup's knee when he tore the leg off of him.
"SHARK!" someone cried, causing absolute chaos.
"No!" Jack yelled, "NO! I'm sorry!"
A lifeguard came over to him and snatched Hiccup who was actually starting to vomit into the sand.
Jack ran after them as another lifeguard grabbed a first aid kit and people began milling around.
"Stop!" Jack cried, shoving people away.
"Sir, step back, your friend will be okay, we called an ambulance." The lifeguard said, checking Hiccup's pulse.
"No, you don't understand! There's no shark!" Jack yelled.
"What?" someone yelped.
"My friend...he has a prosthetic leg and it...it just came off." Jack explained, feeling his face turn red. He knew Hiccup was going to be so embarrassed when he woke up.
"Did Hiccup lose this?" Snot said as he walked over with the prosthetic leg.
Jack groaned and looked down at Hiccup who was still pale.
Yep...he was going to be so mad when he woke up.
.....
"To Hiccup and Jack! For causing a shark panic for no reason!" Snot laughed as they all sat on the porch drinking sodas.

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Trouble (Hijack)
FanfictionJack's sister Punzie goes to ballet class with Hiccup's sister Merida where they get into a fight. This causes Jack and Hiccup to meet and make friends but then 'friends' turns into something more when feelings are uncovered! They then as a couple h...