Warning! This oneshot is a very intense lemon as made obvious my the title...

Note: this is set in a Thanos-less universe, and Bucky's got his Civil War looks in this oneshot

 My feelings for Bucky began merely a month into me moving into the Compound. I was the top student on Tony Stark's internship and he saw my great potential so Pepper hired me full time to work for the Avengers programme, developing their kit and helping design new tech. I felt honoured to be a part of their laboratory and Mr Stark often liked to tease me and call me out on things.

I had met all of the squad within my first week of working at the Compoud, and Steve and Sam had been particularly welcoming. They had a third member of their smaller group; Bucky Barnes formally known as the Winter Soldier. I had read up on all my new colleagues but it was his story that intrigued, upset and disturbed me the most. Mr Stark also seemed to avoid talking about him and having conversations with him but I wasn't sure why.

I wasn't surprised to find out he was a character that liked to stay in the background and observe. I would've been the same if Mr Stark didn't call out for me every single day. One thing I didn't expect however was how attractive I'd find Bucky Barnes to be.

He was almost irresistible, and there were times when I had been embarrassingly caught staring at him, mostly by Steve but sometimes by the man himself. It was undeniable, I had a crush on the man which was highly inconvenient as I assumed romance was not on his list of ways to cope with his mental health and adjusting to his new life. Still I couldn't help but have feelings for him, despite our time alone together being far and few.

Two months after I realised my crush on the man was the first time we really had our first intimate moment. He had just come back from a mission with Sam but he came back to the Compound with a busted up arm. It was July 4th so pretty much every member of staff was off enjoying the festivities or downstairs celebrating Cap's birthday whilst I had to stay and work.

"(y/n)?" Bucky caught my attention, him standing almost bashfully by the door to my lab.

"Hello, how'd the mission go?" I asked, trying to ignore the fact we were alone.

"Okay, except this," he rolled up his sleeve e and I saw that his arm was clinging onto his shoulder socket by merely a few wires.

"Oh my god! Come in, sit down, we need to get that sorted out straight away," I said quickly, gesturing the stool in front of me. I went to collect the arm holder we had designed specifically for Bucky's vibranium arm and I rested it on the table next to us. "It's - er - probably easiest if you take your top off," I muttered awkwardly and his cheeks went pink.

"Okay," he said simply and I had to help him move his almost disconnected metal arm whilst he slid his top off and discarded it on the floor. I tried hard not to gulp or let my cheeks heat up or to appear flustered in any way. I needed to remain professional, so, making sure my eyes stayed north of his chest, I focussed on settling his arm on the holder before taking a closer look.

"To fix the arm fully I'll have to disconnect it, but it seems as though some of the disconnection systems were damaged. This may hurt a little," I warned him. The socket was always the most sensitive part as that was where the mechanisms of the arm connected with his nervous system.

"I'm sure it won't be too bad," he tried to be strong but I knew that was the testosterone talking. Soon he was wincing as I dug between the socket and his vibranium shoulder, trying to disconnect it.

"Shuri did a good job," I admitted, jealous of the girls complex skills as I tried to undo it so I could get the arm off. I had never actually met her, but it was a dream of mine to do so.

"Wakanda is so advanced, I've never seen anything like it," Bucky said softly and I smiled, glad we could start a conversation just the two of us.

"I've never been... I've rarely left the compound since Mr Stark employed me," I admitted.

"If you're into all this... stuff... you should go. You'd like it," Bucky said and I saw the corners of his lips turn up until I pressed on another nerve making him swear under his breath.

Finally I was able to disconnect the arm and I let it rest on the holder. Bucky looked at the metal socket left behind and sighed. "I'm going to have to fix some of that," I gestured a few of the dents and broken wires in the socket and he sighed again, nodding. "I know it's going to hurt... would you like me to give you some of the pain?" I offered but he shook his head.

"I'd like to see you do it," he gestured the socket and I nodded somewhat timidly. I was confident in my skills but having him watch me added so much more pressure. I wheeled over my stool and sat with the socket in front of me, all my tools laid out on the table beside me. I decided to go into full concentration mode, focussing only on the job at hand and not the brilliant blue eyes staring at me whilst I worked. Thankfully there wasn't much that needed doing to the socket and I soon became immersed in my work so I hadn't realised thirty minutes had gone by and had almost forgotten that he was even here watching me.

"There, good as new," I said with a smile, backing away and smiling proudly at my work.

"Thanks," he said and, despite working on his arm socket for the past half hour, I had completely forgotten he was there.

"Y-you're welcome," I said awkwardly, avoiding eye contact with him. "We've got a spare arm for you to wear until I've finished this one," I suggested, gesturing a cupboard.

"Wow, you're well prepared," he said, following me to the cupboard and I opened it to reveal the spare arm. It wasn't nearly as advanced as his vibranium one, nor the Winter Soldier one he had before that but it was still workable.

"We have to think of every opportunity," I shrugged. "It will probably feel weird but you'll get used to it."

Thanks, I appreciate it," he said with a soft smile. He attached it and spun his arm around making sure it was fastened in place properly. "You know how long it'll take to fix that?"

"Not sure... once we get the vibranium shipped to us it shouldn't take too long, unless you want to melt Cap's shield down and use that," I teased and he chuckled. "I've never actually worked on any Wakandan tech before..."

"You'll be able to do it. You're Starks prodigy aren't you?" He asked plainly and my cheeks felt hot.

"I-I guess," I stuttered.

"You coming to Steve's party?" He asked but I shook my head.

"Too much to do here," I said, pointing at my cluttered desk. "Plus parties aren't really my thing."

"Or mine anymore," he said. "Need a hand with anything?"

"Okay... perhaps you should put your top back on first," I held it out for him. I had tried so hard not to look south of his face at his amazing torso, and he blushed when he realised he was still topless. He quickly covered inside up again, calming my rapidly beating heart. "First you can contact Princess Shuri, let her know what's happened and if she can get vibranium over here stat," I said and he nodded, doing as told.

I tried to get him to do all the simple stuff on the various pieces of tech I was working on: Redwing, Clint's arrows and accessories for Peter's web-shooters, but he was having a little difficulty as advanced tech was not his specialist subject. I found it adorable that he was trying, but it reached a point where he ended up just playing with the tools I had, flicking them between his fingers as though they were butterfly knives. It seemed he had a short attention span but I didn't mind, having his company made me happy enough.

- Timeskip -

Bucky had been coming into my lab every day for the past month, as he'd also not been allowed to go out on missions due to the fact he didn't have a strong enough metal arm for the job. I hoped he was coming to the lab to see me, but I knew in reality he was just coming to see my progress on his arm and when he had it back he'd never step foot in my lab again. What saddened me was the fact I had almost finished the arm, and he was sat next to me just watching me work.

"Don't worry, the jobs almost done," I assured him as he watched me piece together the last few vibranium plates. "Then you won't have to keep on coming to my lab," I added carefully.

"Hm? Why would I stop coming?" He asked and I raised my eyebrows, surprised by his question.

"B-because your arm will have been fixed... I assumed that was the only reason you came here every day," I said timidly but he shook his head.

"No. I like your company," he said plainly and the corner of my lips turned up.

"I like your company too," I whispered. We stared at each other for a moment, my heart racing so I tried to snap out of it and focus on his arm once again. He straddled the nearest chair backwards and wheeled it over to me, his head resting on the back of the chair and his eyes watching my hands fix the last bits of his arm. I finished it off by polishing it, the jet black and thin shining gold slits making it look even more stylish than it did do. "Time to try it on for size?" I suggested, lifting it up from the stand it was rested on.

To my shock, despite him not needing to, he ripped off his top right there in front of me. I whimpered, my eyes immediately glued to his abs. "(y/n)?" He said, dragging my attention back up to his face. It was obvious he knew exactly what he had done.

"Right! Yes, here-," I shoved the arm against him, him unhooking the temporary one for me to catch whilst he then attached the vibranium one once again. I realised just how close he was standing to me, merely inches away as I saw his body tense when the nerves connected with his new arm. I was trying to control my heavy breathing as I looked up at him, his eyes already on me.

Like magnets we were drawn into each other, our lips crashing against the others in a passionate, heated kiss. I had been completely swept off my feet as we both got carried away in the moment, my arms snaking around his neck pulling him closer whilst his metal arm wrapped around my waist and the other went to the back of my head, clutching my hair tightly.

I moaned into his mouth, the kiss getting sloppy as our tongues got involved. He pushed me backwards against my lab table, lifting me up onto it by my thighs, our lips never parting. I ran my hand through his shoulder length hair making him groan sexily, whilst he kept one had on my thigh and another on the table, leaning over me slightly.

Finally our lips parted as we were both desperate for air, and it was obvious we needed each other. In the heat of the moment I couldn't stop myself from running my hands up his torso, feeling every sexy curve of his abs. This seemed to satisfy him, but it wasn't long before he pushed away some of the tools littering my workbench, them clanging onto the floor. He pushed me down onto the table and hovered over me, lifting my arms up and holding both wrists in his metal hand. My womanhood felt like it was on fire, and I saw there was a large bulge in his trousers. I knew that whatever was going to happen, it was going to feel good.

He lifted my skirt up, his lips kissing and sucking on my neck. His fingertips explored my thighs, teasing my covered pussy. "Please, Bucky," I whined, wanting to feel his touch.

"You want it?" He growled directly in my ear sending shivers down my spine. I nodded hopelessly and he delivered, pressing his fingers firmly against me. My back arched and I couldn't help but whimper at his touch, him then freeing my wrists so he could unbutton my blouse. I took this opportunity to reach down and rub my hand against his erection, making him moan deeply. "Fuck," he growled, moving his hips against my hand clearly desperate for more.

He turned it into a competition however, and moved my underwear aside before plunging his fingers deep inside of me. "Bucky!" I yelped, my wet pussy making it easy for him to move his fingers. I took it a step further, unbuckling his trousers but I was not expecting what I ended up seeing. He must've been at least eight inches, and as I dared to touch it I couldn't fit my hand all the way around his girth.

"I wanna put it in you," he growled in my ear as I clutched it tightly.

"W-will it fit?" I asked genuinely.

"With your pussy this wet? Yeah," he teased, embarrassing me. We continued to pleasure each other with our hands, his lips then occupying my breasts as he had pulled down my bra as well. I was too high on pleasure to comprehend the fact that anyone could walk in on us at any second - all I cared about was Bucky taking me right here and now. He seemed to read my mind as he pulled away and stood over me, staring at the mess he'd made of me.

"I need it," I whispered. His hungry eyes ran over my dishevelled clothes, and soon he tugged my underwear off completely. "I-I'm on the coil," I whispered.

"What does that mean?"

"It means I can't get pregnant," I said timidly and his blue eyes sparkled with mischief. I felt him aline his large dick up with my pussy and in one swift movement he inserted himself deep inside me. "Bucky!" I yelled, the feeling being enough for my orgasm to hit.

"Did you cum already?" He teased, my body trembling underneath him.

"Shut- up-," I breathed, embarrassed but he seemed to love it. With one hand on my hip and the other restraining my wrists again, he pounded into me hard. His rough movements made the table scrape back and forth, his power causing some of the tools to fall off but neither of us cared about our surrounding, we only cared about each other.

I had never had a man quite like him before. The powerful way he moved, the lustful gaze in his eyes, his ability to make me feel as though I had died and gone to heaven was all too much and it was sending me into an erotic state. "Damn- you feel good," he growled, slamming into me harder, his dick brushing against my g-spot with every push. All I could respond with was a nod and a moan of his name, my mind going blank from the white hot pleasure. "I can cum in you?"

"Yes! Yes!" I screamed, my legs wrapping around his waist.

"Good," he growled, slamming in one last time and pouring his cum inside of me. This made me release also, squirting all over his pelvis. When he pulled out I felt his cum slowly drip from my pussy but I was too shocked and tired to move, basking in the aftermath of the incredible feeling I had just been served. "Ready to go again?" He asked and my head shot up to see him rock hard again.

Never had I ever been with a man who could get it so hard again so quickly, and I had a feeling that was because of the things the Super Soldier serum had done to his body. I nodded quickly, needing him. He pulled me up and tore off my lab coat followed by my blouse, his trousers falling completely to his ankles as he pushed me over the table, entering me from behind.

I moaned loudly, the sound of skin-slapping reverberating around the lab, my breasts rubbing against the cold surface of the table making my nipples harden. He grabbed a handful of my hair and pulled me up by it, the pain giving me pleasure. He nibbled at my neck, his metal hand cupping my breasts and playing with my nipples. There were tears of pleasure in my eyes as he whispered dirty things in my ear, things I'd never expect him to say.

"Your pussy is so good, god it's better than I dreamt it," he growled, catching me off guard.

"H-huh?" I moaned, trying to look back at him and feeling myself getting so close to another orgasm at his sexy expression.

"Every night I've imagined this," he grunted, slapping my bum making me cry out.

"Really?" I breathed and he smirked, nodding. Just as I had always wanted him to take me, he had been dreaming of exactly the same thing.

"Damn right," he slammed even rougher into me, my mind going blank as another orgasm washed over me. He too came deep inside my pussy, it mixing with the cum from his previous release. "Ride me," he suddenly demanded, pulling out of me and still being hard. I turned to see him kick off his trousers that had pooled around his ankles, along with his shoes and socks leaving him naked. This sight was truly a gift given from the Gods.

He tugged my skirt down and unclasped my bra leaving me naked also, and he sat on one of the wheeled chairs, inviting me into his lap. I straddled him and he gently lowered me onto his dick, it filling me up even more from this angle. My throat was dry from all the moaning and my body felt weak but I was desperate to pleasure him. I needed to deal him the amount of pleasure he was dealing me, so I bounced up and down on him ignoring my burning thighs.

I dug my fingernails into his shoulders, undoubtedly leaving red marks on his skin but neither of us cared. He latched his lips around one of my nipples, sucking on it hard and I was finding it difficult to keep up with the bouncing. "That's it doll, you're doing so great," he growled in encouragement, this giving me the motivation to keep going. His dick was reaching pleasure points I didn't even know existed, and it was making me go crazy.

"Fuck, Bucky, Bucky!" I cried out, throwing my head back as he squirted deep inside of me for the third time. My body was twitching violently, my pussy soaked with both his cum and mine but it wasn't enough. Both he and I needed more.

This led to me being fucked raw against the wall, in doggy style on the floor and eventually both of us on the table in missionary style. My pussy was dripping our mixed cum down my thighs and onto his pelvis but we were both too drunk on pleasure to care. All we cared about was each other and the heat of the moment, the intensity of how good we were both feeling. It was by far the best I had ever had.

My nails had left scratch marks all down his back, and I had sucked on his neck so much that there were already multiple hickies showing. My lips felt swollen from all the sloppy kisses he had given me. "I-I can't believe- you're still going!" I cried out, his lips sucking my breasts. "You've cum seven times!"

"Are you complaining?" He growled menacingly but I shook my head.

"No, no it's amazing!" I screamed out, tears leaking from my eyes. All I felt was pleasure, was Bucky, was his dick pounding into me ruthlessly. I had never been fucked with such intensity, and I knew already that I was hooked on his dick.

"Doll I'm gonna- cum again," he moaned, his thrusts becoming sloppy.

"Me too- yes, yes, yes!" I screamed grabbing ahold of the table as a violent orgasm washed over me madly.

"(y/n)!" He yelled, pushing in deeply and filling me up to the brim again. When he pulled out he collapsed backwards onto the chair, panting heavily and his dick slowly softening. I was left a panting mess on the table, sweat, saliva, tears and cum dripping from my body. I could barely move he had fucked me so roughly, but it felt beyond incredible. I knew there and then that I was completely submissive to him, that he could do whatever he wanted to me and I'd happily accept it. "You okay?" He asked, and I used the last of my energy to lift my head and see him glistening with sweat, his eyes glued to me.

"I think so," I breathed, my chest rising and falling heavily.

"I think we need to get washed up," he said and I laughed, nodding. He got me a few tissues to wipe up the mess he had made of my pussy, and we dressed ourselves, him having to help me due to my lack of energy. We left the lab, me locking it behind me so that no one went in and saw the mess. I made a mental note to clean it later, whilst he helped me back to his room. Thankfully we didn't pass anyone on the way, and he let me go in the shower first, admitting that if we went in together he wasn't sure he would be able to hold back.

When I was done and it was his turn, I sat on his bed wearing the his top he had gotten out for me to wear. My underwear was too soaked for me to put back on so I pulled down the top a little further, hoping it covered me. A part of me was scared as to what would come next - was this just a heat of the moment thing? Was this a friends with benefits deal? Would he care about being more than friends?

He came out of the shower with just a towel around his waist making me freeze up even more. "You okay?" He asked, apparently sensing my nervousness.

"Was that... a one time thing?" I asked hesitantly and there was a look of worry in his eyes.

"I hope not," he said quickly and the corners of my lips turned up.

"Then... is this a friends with benefits situation or a... relationship situation?" I dared to ask and his cheeks flushed pink.

"I don't know what friends with benefits are but... I'd like us to be in a proper relationship... if you want," he said and my smile grew wider, this comforting him.

"Yes, I'd like that," I whispered, him leaning in and kissing me passionately.

"Sorry if I was too rough on you," he said bashfully but I shook my head.

"It was perfect Bucky," I assured him, our lips meeting and the two of us falling back onto his bed, once again getting carried away.