This is based around rtte. This was done on a request from someone on Fanfiction. I hope this is somewhat like what you wanted!

Drabble three – Flight suit and fetch

It was hot in the forge, as always, and Grump snoring didn't help. He breathed out bursts of hot air with every snore. Hiccup wiped his brow as he pounded the metal into the correct shape. Astrid needed new shoulder pads, and he'd agreed to make them. On the table was HIS armour. Made mostly from leather.
"Hey babe! How's my shoulder pads looking?" Astrid's cheery voice called as she entered. Hiccup straightened up and grinned at her.
"Hey, not too bad. They're almost ready, don't you worry!"
"I really appreciate your help babe. I see you've improved on yours." She commented lifting up a black shoulder pad, decorated with a Viking face like the one on Toothless' tail. He just hoped she didn't look too closely at the rest or he'd never hear the end of it.
"Yeah, figured it was time. Made a helmet too. I'm sick of swallowing bugs."
"This thing?" She laughed picking it up.
"Yeah…"
"It's ridiculous! You're going to look so stupid in this!"
"Well we'll just see about that!"
"And this suit thing… why have you got leather things going down your legs? And what on Midgard is…" Oh dear. She'd seen it. "Hiccup…" Her voice was low and dangerous. "Is this what I think it is?" She held out one wing from his suit. He swallowed hard.
"It's errr… the dragon fly three."
"Hiccup!"
"What?! I swear Astrid, it's fine! I'll be totally fine in this model, it is based on dragon fly two and that worked!"
"And who is going to catch you when you fall?!"
"Well Toothless…"
"TOOTHLESS CAN'T FLY WITHOUT YOU, YOU MUTTONHEAD!" He flinched slightly when she yelled
"I've been working on a system to lock his tail so he can glide and do basic flight manoeuvres…"
"HICCUP HADDOCK!"
"Astrid Hofferson! It'll be fine!"
"HOW IS IT GOING TO BE FINE WHEN YOU PLUMMET TO YOUR DEATH?!"
"If you're that worried you can come with me when I test it out."
"DAMN RIGHT I WILL!" He hadn't been serious. She'd only tell him how stupid he was the whole time and demand he call her right if it went wrong the first couple of attempts.
"Astrid…"
"I worry about it Hiccup because for some reason I'm crazy enough to care about you!" She said dropping it back onto the table. "I don't particularly want to see you smash into the rocks face first." She folded her arms and looked at him. He gave her a nervous gap-toothed crooked smile.
"Hey…" He held onto her arms and stared into the blue oceans in her eyes. "I'm going to be careful with this. But, I'm going to do it." She sighed.
"I know. Because you're crazy and stubborn and Hiccup. No matter what I say, you're going to do it. But you have to accept I'm coming along because someone has to save your sorry ass when it goes wrong."
"It won't go wrong."
"We'll see."

After several attempts, Stormfly had become a master of playing fetch and Hiccup conceded that it wasn't perfect yet but he'd get it right soon. To which Astrid had Stormfly snatch him from the cliff edge and carry him back to his home where she hoped he couldn't get into any more trouble.
But they got into a lot of trouble when Stoick came home and found them.