Hi, guys! This is my contribution to this wonderful, absolutely addictive fandom! Hope you'll like it and feel free to leave a review or a prompt!

Sorry if there are any grammar mistakes, but English isn't my first language.

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The day started like a complete nightmare.

When Steve Rogers - formally known as Captain America - woke up he felt like something was different, but couldn't exactly tell what. He just shrugged it off, threw a glance at his lover who was still peacefully sleeping with a hand on Steve's side of the bed and walked to the bathroom.

He decided that he'll let Bucky sleep a little more today and wake him up just in time to get ready for their morning jog with Sam.

Upon entering the bathroom he was greeted with the reflexion of his body as seen in the mirror.

His little, scrawny, skinny body that absolutely yelled preserum Steve Rogers.

He opened his mouth to curse but instead a loud scream full of terror escaped his mouth.

Bucky was up in a second, almost falling because of the sheets knotting themselves in his legs, and ran to the bathroom. He was expecting anything: aliens, robots, super agents sent by HYDRA to kill them.

Not his best friend and lover, naked in front of the mirror, screaming while looking at his reflexion.

"Bucky!" Steve shouted, waving his arms up and down. "Look what happened to me!"

"What the fuck.", he whispered, taking in Steve skinny body. "How the fuck did that happen'?"

"Oh my God! Oh my God!" Steve kept repeating over and over again.

The Captain could swear he saw black figures dancing in front of his eyes. He could swear the Earth suddenly ran away from beneath his feet. Next thing Steve remembered was falling backwards and Bucky moving too slow to catch him.

Everything hurt and it all went black.

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''I'm going to fucking kill him!" growled a voice from around him.

"Relax, dude, everything's going to be fine. You heard the man, it's going to wear off in a couple of days."

Wait, Steve recognized the second voice. It was Clint.

"I'm going to rip you apart, Loki, just wait and see!" the first voice said again and he sounded dead serious.

"He provoked me. He insulted my brother." came the amused, accented voice of Loki.

"What a great excuse. This means I can totally rip you apart for doing this to Steve!"

Now he recognized that voice. It was Bucky.

Loki chuckled delighted.

"Oh, just try. I dare you to do that...Terminator."

Before Bucky could respond, Steve heard Bruce Banner's voice shutting the both of them up.

"If you continue like this I'm going to get angry and go all Hulkish on you and rip you both apart. Would you like that?"

Silence.

"That's what I thought."

"Dear Lord, he's so skinny. I understand that you guys went through the Depression and everything but still, couldn't you like, go around and hunt some deers?" Tony asked. "J.A.R.V.I.S., come up with a menu for Capsicle, here, we need to feed this boy some proteins."

"Suck my dick, Stark." Bucky growled again and Steve opened his eyes yelling at Bucky:

"I told you one too many times to watch your filthy language, Buchanan!"

"Oh my Lord, he's annoying even in his tiny form." Tony laughed and Sam snorted.

Steve heard the words roll out of his tongue before he could stop them.

"Fuck off, Tony, will ya?"

"Oh, look, he can swear!" Sam completed sarcastically and Clint laughed.

"Ya too."

"How are you feeling, Steve?" Bruce asked, trying to occupy his mind with something else.

"Short and weak, and oh my God, I think my asthma is back." Steve moaned and Bucky looked at him with sad, puppy eyes.

"Well, you're not wrong. I took the liberty of running some tests on you and every health issue from your past is...back."

"Oh, no."

"But, I think I'll be able to help you, you know, just in case something happens."

"Thank you, Bruce." Steve said, trying to smile at him.

He looked at Bucky who was studying him closely. Steve didn't like the way Bucky's eyes darkened upon watching him. Steve didn't like the way Bucky reached out to help him into a sitting position. Steve didn't like the way Bucky placed his fingers very carefully around his hand, afraid that he might crush him. Or how he quickly put his left arm in his pocket, afraid that he might use it on Steve and kill him by caressing him too harsh.

Fuck this, Steve tought.

"Why dontcha' go and fuck yourself, Bucky? How about that?" he said, and Bucky offered him a confused look. "Stop looking at me like I'm some porcelain thing ready to break!"

"Oh my God, shut your mouth, you punk. I'm trying to help."

"Well you're not helping at all. In fact you're pissing me off right now. You look like you're walking on egg shells."

"Well you're just as fragile as one." Bucky fired back, a smirk plastered on his face. It felt like the 30s all over again. When Bucky would non-stop tease Steve with the intention of making him angry.

"I'm gonna punch you in the fucking throat. Don't push me, Barnes." Steve growled.

"You'll have to grow up a little to do that, Captain Mini."

Steve did punched him that morning. Not in the throat, but he aimed directly his nose. Sure, it was a low blow, punching your boyfriend and stuff, but Steve was mad at Bucky for making those jokes on him. And it's not like the hit actually affected Bucky, it just surprised him a little.

Long enough for Steve to get up and go to the bathroom.

"You motherfucking punk!" he heard Bucky laugh.

"Watch your fucking language, you jerk!" came Steve's reply.

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The next couple of days were filled with apologies from Bucky and glares from Steve when his boyfriend just couldn't resist throwing in a joke based on Steve's size.

"What happened to you killing Loki for doing this to me?" Steve asked frustrated one night.

"Well I like you like this. You're pretty cute." Bucky laughed.

Steve glared at him again.

He was Captain America.

He surely wasn't that cute.

He was forced to stay home when the Avengers took off on a mission. He didn't like that, not one bit. It wasn't fair to be treated like a porcelain doll, but when Bucky said no, it was no. It's not like he would be helpful in case or something happened. He was too weak to protect himself and too weak to try and fight the bad guys.

"Captain Rogers" came J.A.R.V.I.S' voice, and he was so thankful that he still addressed him with 'Captain'. "Sergeant Barnes is trying to contact you, shall I put him on speaker?"

"That would be nice, J.A.R.V.I.S., thank you."

He heard a beep and suddenly Bucky's voice was screaming at him.

"Steve, I hope you don't mind, but I'm using your shield right now."

"You gotta be kidding me. Did you just called me in the middle of a fight?"

"I just wanted to tell you that I'm sorry for acting like a dick these past couple of days."

"Oh my God, I'm hanging up now, I can't believe you took time to chat in the middle of the fight. What's wrong with you?"

"Well I might die today and I wanted to tell you I love you, just in case."

Steve sighed, rubbing his hand across his face.

"I love you too, Buck."

"Good, good."

"I'm going to hang up now."

"Okay, bye, thanks for letting me borrow the shield."

"I didn't let your borrow anything! You fucking stole it from me."

He heard Bucky's laughter before hanging up.

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It was two or three hours after midnight when Steve heard the voices of his teammates in the livingroom. He tossed the covers aside and stood up stretching. Something felt oddly familiar about him.

It was like...he was back.

He decided to check the bathroom at first, before joining the other Avengers in the livingroom, and soon enough he was greated by the tall, built-up image of his body in the mirror.

Steve grinned, before putting on some pants and debating on weather he should put on a T-shirt or not. He decided against it. Showing them his muscles was surely his payback after a week of non-stop teasing.

Oh, he's definetly going to give Bucky a run for his money.

He tiptoed into the livingroom, taking his time in analyzing his teammates. All of them presented various injuries, but nothing that looked too serious.

It was Tony who noticed him first, groaning as he took in his appearance.

"Oh hell no, you're back to your annoying self."

All of the eyes turned to him and Steve offered all of them a huge smirk.

"What? Done with the jokes, now, Iron Kid?" he asked, obviously picking on Tony's height.

However Tony didn't have a chance to reply, because Bucky suddenly jumped on Steve, sighing relieved when the Captain didn't even stumble backwards. Their lips where glued in a second.

"Hell no, I'm not staying to see what they're going to do next." Clint said who was silently followed by Sam, Natasha and the two gods, Thor and Loki.

"Damn, Barnes, you're a monster for even thinking of having sex with your boyfriend after that battle."

"Fuck off already, Tony." Steve moaned out, carring Bucky in their room.

"Please try and keep it quiet." Tony yelled after them.

Steve was trailing kisses down Bucky's abs, when he whispered:

"Sit back and let Little Steve take care of you, sugar."

Steve was pretty sure that no one in the Avengers Tower sleeped that good with Bucky screaming his name for the most of the night.