They landed a street over from the epicentre and the team quickly ran towards the beast. It was easy to find as screams and the sounds of it breaking things echoed out from its location. Thor and Tony took off into the air to get a location on the thing and guide the team in. Rocket blasters at full, Tony was powering ahead so it was only by pure coincidence that he glanced back to the team. He had to double take when he noticed Steve was falling behind; usually Steve took the leadership role on missions and lead the group during the fight. Something seemed off to the genius so he quickly curved around and headed back despite Thor's confused looks.

As he got closer he could see the cause of Steve's unusual behaviour. The man was still attempting to run whilst leaning down with one hand grasping into his prosthetic leg as though he was trying to hold it together. Stark frowned and landed next to the soldier. Something inside of him told him just to continue on without the soldier but another part of him was reminded of the pain of Steve's phantom pains only shortly before.

Steve looked grateful that Tony's presence allowed him to stop running and when he stopped the soldier whipped his hand away as though nothing was wrong. The genius wanted to roll his eyes at Steve's macho antics; the remanence of his former military training was still firmly drilled into him.

Visor rising, Tony didn't waste any time, "What's wrong?" Although he hated to admit it, Steve was one of their strongest team members and they needed him in order to function as a team.

Almost as though he knew Tony was his only viable option, Steve sighed and sat down on the curb to began pulling up the leg of his pants, "My leg... they tried to repair the damage from last night but something isn't right."

Tony knelt down in front of his teammate, his hands hovered over the metal leg as his eyes scanned the device. It was more advanced than most you'd find in public use as obviously SHIELD had obtained the very best for one of their key weapons. Tony hoped that he'd be able to get a proper look at it soon as he was very much intrigued by its inner workings.

Footsteps approached, Bruce was running back to find out what held them up. Luckily, he hadn't yet transformed into the Big Guy so he was able to fetch his friends.

The scientist stopped a few steps away and stared open mouthed at the scene before him. He blinked and frowned, "You... your leg."

Steve nodded, "I have a prosthetic leg."

"Oh..." Bruce stared for a moment longer before he was able to control his inner scientist and researcher and approach him, "Do you need help?"

"I've got him," Tony answered before Steve could even begin to reply, "You'll probably be more use to the team until we catch up. Let them know we're on our way."

The doctor flushed and nodded before jogging back off to join the others. Bruce glanced back to gain another look as he began running in the opposite direction; his curiosity was similar to Stark's in its scientific nature. However, Steve was silently pleased he didn't have any more of an audience with his malfunctioning leg.

Steve's eyebrows rose as Tony placed his hands under the leg with the gentlest touch Steve had ever witnessed from the man. With only a guiding force, Tony turned Steve's leg slightly to the side so he could take a look at the mechanics which allowed the joint to bend when the man walked. He bent the leg and easily saw that it was overly stiff so the function that sprang the leg back was broken or hadn't been adequately repaired.

He squinted into the technology and managed to get his fingers amongst the wires and pistons. He found the solution almost immediately; a wire had gotten wrapped around the mechanism that pushed the leg back into a straight position after it bent to take a step. He wiggled them apart and re-tested the movement. It was now smooth like it was designed to be but being this close up Stark could identify several components that could be altered or upgraded. His mind was already whirring at potential changes he could make in his lab and the thought of having such a worthwhile project excited him.

"There," He said softly and began to re-cover the prosthetic limb, "That should do it."

"Thank you," Tony's hands were still placed under his leg and, even though it wasn't his flesh, the action felt somewhat intimate and Steve couldn't help the blush from rising to his cheeks. He'd never seen this side of Tony before and he'd have to take some time to think about what this meant.

Stark smiled as if he knew something Steve didn't, "Come on, let's catch up. They have no chance without us." Despite his words, he held Steve for a couple of moments longer and peered up into his blue eyes.

The sound of a car being launched through the air and crashing into a building broke the air around them and they snapped apart.

"D'you need a ride?" Tony smirked as he prepared to take to the air again.

"No, thank you. One mechanical leg is enough, I can't imagine a whole suit." Despite his rejection he smiled gently.

With a nod Stark took off to join the others. Moments later Steve was following on foot and he'd be there shortly now that his leg was working smoothly. Thanks to Tony's quick adjustments, the mission was a success as Steve had managed to get in there and manage the team like he knew was best.

—

It was one week later and Steve had decided to turn in early. He'd spent a couple of frustrated days alternating between trying to make do with his malfunctioning prosthesis and having to use his crutches. Him throwing the leg against the wall (which was all fixed now) and turned out to do more damaged that he'd intended. The leg was struggling to deal with the damage and the shoddy repairs they'd done last minute to ensure Steve would be able to fight that day kept failing.

So, out of frustration and a sheer lack of willpower to continue fighting with the device, he had ripped it off and climbed into bed despite the early hour. He was just considering how nice it felt to be free of the prosthetic for a while so he could move his body freely under the sheets when the door suddenly opened and Tony marched in.

The lights snapped on and the genius froze with something in his arms.

"Tony?" Steve asked in shock. However, the shock he felt today was much more pleasant than the distain he would have felt a couple of weeks ago when they first met. Their relationship had somehow transformed during that time.

"Oh shit! Sorry, I was just... Wait, why are you in bed, grandpa? It's 9pm." He pulled an incredulous face as he gestured to the man fully tucked up in his king size bed. All that was missing was a mug of hot coco and a glass for his dentures.

Steve sat up, the blanket fell from him and, upon the reveal of his muscled chest, Stark was reminded that Steve was, in fact, definitely not a grandpa. He felt his eyes linger on his body but snapped himself out of it immediately as he remembered that it was Steve and they had a complicated relationship.

"My goddamn leg was giving me jip and I couldn't stand another moment with it or in my crutches." He gestured over to where the keg was propped up beside his chair where he strapped in every morning.

A fake gasp came from Tony, "Language, Captain."

He laughed, the freest laugh Tony had yet to hear from the soldier, "The goddamn leg deserves it!" Reality seemed to settle moments later, "Is there some reason you're breaking into your guests rooms in the night while they're sleeping?"

"One: You're not sleeping. Two: it's hardly breaking in when it's my house. Three: I thought you were out because Jarvis said all lights were out." He shrugged. He stepped closer to the bed, "I wanted to bring you this."

The inventor placed a suspiciously-leg-looking device on the end of Steve's bed and stepped back.

He watched as Steve inched forward to pull the prosthetic up onto his lap so he could begin assessing it. It was sleek and didn't seem to hold even half of the technology of the SHIELD one, no wires were on display. The light metal was cool against his fingers as he silently touched the leg.

"It's a prosthetic?" Steve peered up at the man.

"A new one. I made it." Tony stepped forward slightly, "May I?" He held out his hand to request the prosthetic.

Passing it over, Steve pulled himself out of the bed so he could sit on the edge. It felt somewhat intimate to be in a room with Tony while he was topless. He silently thanked the Lord that he'd chosen to wear pyjama pants to bed tonight as he often didn't.

Tony knelt in front of him similarly to how he did a week before. From such close proximity to the man's perfect body the inventor could see the scars ranging in size littering the torso. Lifting the man's pant leg, he rolled it up until he had full access to Steve's amputation site but he could tell by the way Steve clenched his fist that the man felt vulnerable being so exposed. Tony rested his hand on the other knee to reassure him of his purely good intentions. Hadn't Steve learnt by now that something about that first night tonight had changed the way they viewed each other?

Carefully, with his attention completely captivated by his work, Tony began to attach the prosthetic to Steve. He took his time and ensured everything was properly in place and that any material that would cause Steve discomfort was hidden behind the gentle silicone. His large fingers softly touched the skin of Steve's thigh, moving in massaging circles.

The inventor had finished the fitting but he remained motionless aside from the minute movements of his fingers. Steve's breath hitched at the fondness of the action and it took him a moment to register when Tony finally told him to stand and try it out.

The soldier stood and Tony followed his motion. He reached into his pocket and pulled out a patch that didn't look much bigger than a postage stamp. After peeling the backing off, Tony reaches up to position the sticky patch behind Steve's right ear. His hand lingered there for a moment as their eyes met again. Steve's heart began to race.

"Okay, that's basically a signal transmitter so it gets the leg ready for anything you are about to do and more. Give it a go." Tony stepped back to give him space to explore.

Steve looked uncertain for a moment before he paced the length of the room and, with each step, his eyebrows rose infinitely higher. By the time he was running around the room, a huge smile had laid stake to the man's lips. He jumped and leaped and even jumped on the bed.

"I can't believe it." Steve uttered between deep lunges, "It almost feels like... like I still have my leg."

"It should do. The chip is reading all the signals your leg would have received and is relaying them to the prosthetic so it moves exactly how you remember." Tony shrugged from where he was watching it all unfold. He'd never particularly liked Steve Rogers so if you had told him 6 months ago that he would spend days working on a prosthetic for the man then he would have called you a liar. Somewhere and somehow between then and now, his opinion of the soldier had completely flipped. He could identify with the man's pain and his struggle with his prosthetics as Tony had had issues with the Arch reactor several times before.

The large man, who currently seemed more like an over grown puppy, stopped in front of his teammate and smiled, "I don't know if I could ever thank you."

"You don't need to." Tony answered, he was accidentally displaying his softer and more vulnerable side again, "Anyways, that's all I wanted to give you. I'll hit the road so you can get back to bed."

The inventor had his hand on the door handle when Steve's voice stopped him, "Why'd you do it?"

Peering over his shoulder, Tony's voice seemed sad, "Because you deserve better."

Tony's mind wasn't able to follow what happened next but the next thing he was able to process was Steve's lips on his. He'd turned and his back was leaning against the door which he was grateful for as the shock of it made his legs wobble. Steve's large hand cupped Tony's cheek and he used it to pull him closer. The blond man's other hand was resting on the door beside Tony's head so, for a moment, Tony's world was Steve and Steve alone. It was intoxicating.

They kissed and neither knew how long for but they split as their lungs became desperate for breath. As they parted the billionaire suddenly realised that his hands had snaked up onto Steve's naked torso with his fingers caressing the hardness of his abs. He felt slight bumps which were the light scar tissue left over from the accident. He dropped them awkwardly and Steve chuckled.

"You... you didn't have to do that because of the leg..." Tony went cold at the idea of Steve somehow using Tony's developing infatuation with the hero as payment for the prosthetic.

"Don't be ridiculous. I think I've wanted to kiss you since that first time I woke up with you in my bed." Steve smiled, they were still so close together.

Tony smirked, "You should have. You'd probably be getting more than a prosthetic leg now if you did."

The soldier smiled, "Thank you, Tony. For then and for now."

"Don't worry about it. It's nothing."

"And I'm sorry for how I acted afterwards... I realise now that I had completely misjudged you and it was so wrong of me." He flushed in his shame.

"Don't even think about it. I thought similarly bad things of you." Tony replied as he got ready to leave again.

The smaller man loitered by the door as if waiting for something but, just as Steve opened his mouth, the smaller man opened the door and marched out quickly.

Steve, however, was faster thanks to his new prosthetic and managed to catch the Tony by the elevator. He grabbed the man's hand and pulled him back towards the bedroom as he placed luscious kisses on his lips. Tony went willingly as Steve's mouth put him into a trance.

The genius hummed in satisfaction as Steve pushed the door shut behind him. Tony took the lead now as he lowered the soldier onto the bed and gazed down at the exposed chest to run his fingers over the tight muscles there. Fingers grazed over raised skin as his touch found the large scars from Steve's accident again. Tony's mind instantly leapt to imagining what might have caused it. Did the freezing do it? Or something from the war? Or before? He'd still not been told of anything that had happened to Steve from before they met.

It was almost as if Steve could read Tony's rapidly firing thoughts as he gently eased the other man's hand away from the scar tissue and onto his shoulder. Now was not the time for reliving trauma. Tony didn't try and explore the scars further as he knew from his own experience how triggering it can be.

However, he dropped his hand to rest on Steve's waist band and, upon Steve reaching out for Tony's own belt, he touched the other man through his pyjama pants. Their mouths parted as Steve's breath hitched and his fingers clumsily rushed to undo Tony's belt. It took him a moment but eventually he released him and managed to get Tony out of his skinny jeans.

"Oh, God." Steve murmured as Tony's hand never strayed from massaging his dick through the thin material.

Those words were all Tony needed to send him wild with desire for this man. He pushed Steve back until he was lying completely flat on the bed and Tony lowered himself on his knees in front of the soldier. He peeled off the pants so Steve's dick was standing erect only centimetres from his mouth. Tony knew Steve would be large but the man was currently surpassing all of his expectations.

Steve shivered as he felt Tony's breath ghosting over the sensitive skin in a tempting taster of what was to come. He didn't have to wait long as the man grasped tightly onto the base of Steve dick making him suddenly gasp. The genius' other hand massaged firm circled into the man's scarred thigh just above the amputation site to encourage him.

Eyes closed and head thrown back at the sensations, Steve wasn't prepared for the feeling of Tony's tongue against the tip and it moved along the slit so Tony could taste the pre-cum. The soldier was balling his fists into the covers of his bed as he began to squirm at the slow, teasing nature of Tony's touch. He knew exactly how to wind him up and would ensure it was a journey full of desperation and need.

Tony lowered his mouth onto Steve's dick and moved all the way down until he could feel the throbbing tip pressed against the very back of his throat. Having learnt to deep throat years earlier, this posed no issue and the genius took him deeper. Moaning, Steve curled his fingers in the dark hair as Tony continued his ministrations. The deep warmth was too much for him.

"Tony, I-I can't hold off any longer." The soldier groaned. The gentle touches and kissing had meant that he'd Egan to get excited long before Tony had even started.

"Then don't. Come for me." Tony purred. He took Steve into his mouth again and with barely a touch the soldier came.

Tony felt pleased with himself as he drank down every trace and worked Steve through his orgasm. The soldier laid back with his eyes closed and chest heaving to catch his breath.

"Oh God, Tony."

"Yep." He chuckled.

Steve immediately sat up as a realisation struck him. A dark, mischievous look passed over his features as he smirked at his lover.

"Come here." The soldier ordered. Tony obeyed as he climbed onto the bed until he was straddling the thighs of the taller man. He could feel the cool silicone of the prosthetic under his legs but his attention barely noticed it; he was far to distracted. Steve leant up to kiss Tony while his hands removed Tony's last article of clothing, his shirt, and demanding hands explored the tight form underneath.

Steve could taste himself on Tony's tongue and the idea almost made him hard again. It was having a similar effect on Stark who was moaning at the feather-light pressure his dick was receiving from simply their torsos being pressed together.

They continued making out as Steve's hand snaked down between them and grasped his member. Tony gasped into their kiss and it only encouraged the other man to stroke faster and harder. The billionaire could feel himself being wretched towards the precipice and he knew he was going to come any moment. Just the thought of Steve Rogers jerking him off sent his stomach muscles clenching and his eyes screwing up.

His muscles clenched and his brain suddenly stopped functioning as the orgasm hit him full force. Closing his eyes, he fell forward and rested his head against the man's broad chest and the soldier held him up while chuckling gently.

Tony didn't have time to consider why a simple hand job had sent him reeling so much but he was maybe beginning to admit that he might have a major crush on Captain America.

He opened his eyes when he felt Steve's lips pressing against his. The kisses were less frantic and desperate but had instead become gentle and fond. He felt Steve card his fingers through Tony's short hair and it sent a gentle shiver down his spine.

"Here," Steve whispered gently as he shifted the smaller man onto the bed, "Lets get you cleaned up."

Tony, now sprawled out on Steve's soft king size bed struggled to keep his eyes open as Steve cleaned them both up. He hadn't thought about his come creating a mess of both of their torsos.

Minutes later, Steve was taking off his new prosthetic and climbing into bed beside Tony. They both wouldn't admit to making the first move but somewhen throughout the night the men ended up entwined together and it was the best night sleep they'd had in years.