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floralcyanidee · 8 months

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ɪ sᴇᴇ ғɪʀᴇ - ᴊ. ʀᴏʙᴇʀᴛ ᴏᴘᴘᴇɴʜᴇɪᴍᴇʀ

Cillian!Oppenheimer x AFAB!Reader (NSFW)

request: scientist reader and Oppenheimer have sm sexual tension between them and trying to hide their feelings for each other cause they're colleagues but then when the Manhattan Project comes up and they both work on it together it just gets too much to handle. by @aporiasposts

disclaimer: this is a work of fanfiction. cillian's representation of oppenheimer is also fictional to a degree. if you dislike this kind of fanfiction, please keep scrolling and do not interact with this post. otherwise, have a lovely day. ♥

warnings: smut, penetrative sex, p in v sex, unprotected sex, multiple positions used, mutual pining, years of sexual tension

word count: 2090

author’s note: please read the disclaimer several times if you must before you decide to comment something snarky or send a dense anonymous ask. (: this is my first time writing smut for Robert so it was interesting!! I rather enjoyed it and I think I'm going to finish the other smut I was going to write for him. also, I changed the request details a little. reader is a historian/ political scientist of sorts instead of a scientist. I feel like there is a lot of scientist!reader fics out there and wanted to be a little different haha. I hope everyone enjoys!

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Having a doctorate in history has led you to places you never thought possible. One of those places ended up being the University of California - Berkeley. You were given the opportunity to lecture there with some of the brightest minds in the country- one of them being physicist Dr. J. Robert Oppenheimer. Your disciplines differed but had the same solid foundation of facts, evidence, and logic. Needing to see things to believe it for yourself was one thing the two of you had in common, which brought you together. You were interested in his lectures and as he was yours. Both of you have learned a lot from each other and have become good friends. However, there were times when you would interact, and it felt intense. You’d grade papers together in comfortable silence, sometimes stealing glances at one another. Whenever you caught Robert staring, you’d give him a small, knowing smile. When he caught you staring, he’d hold your gaze, which made you nervous.

You enjoyed attending Robert’s political discussions after class to see how passionate he was about current issues. Dr. Lawrence, your other beloved colleague, often warned you to avoid them, but you ignored him. The energy you’d feel toward Robert every time he’d rant about how every person deserves the freedom and the right to choose was electric. It was the very basis of your beliefs as a historian and a professor. The two of you would often go for a cigarette in the courtyard between classes to enjoy the fresh air and discuss politics. Robert loved hearing your stance on things, especially since you knew your stuff about the history of politics and how things work with them. The tensions were high that day, and before you knew it, Robert leaned into you as you spoke. But before anything could happen, it was time for classes to resume. So you went your respective ways.

When you were contacted by the government to assist on a top-secret project, you were shocked. They needed your expertise in politics and history, as well as your reading and writing skills. You asked if Robert would be involved due to his talent in psychics, but you got no answer. You didn’t take long to learn of Dr. Lawrence’s involvement in the project, and you were ecstatic to have someone you knew tagging along. He was worried about Robert not being present for the Manhattan Project simply because of his mutual and close friends being communists. You insisted you’d speak to Robert about the matter, but Ernest objected. However, after a meeting about the Spanish Revolution that Robert had held, Ernest blew up on him. He mentioned there was a project and that Robert wasn’t allowed on it as long as he was sticking his nose in communist politics. So, Robert stopped the meetings, and sure enough, General Leslie Groves eventually poked his way into Robert’s office one afternoon to discuss the Project.

Now, the three of you were involved and had to leave Berkeley. Robert quickly assumed the position of Project leader and already had a location picked out for the Project headquarters. You had heard many stories of this location from him and demanded he take you to it before construction began. You and Robert left Berkeley and traveled to Los Alamos via horse, talking and laughing the whole time about your childhoods and times in school. You both decided to camp there overnight and enjoy the desert and its beautiful sky before dealing with the most significant project in human history. As you sat by the fire that night with Robert, you stared at the sky in wonder. Robert watched you with just as much wonder, enjoying seeing you smile. Because pretty soon, there wouldn’t be much to smile about.

By the time you had moved into Los Alamos and started getting to work, the tension between you and Robert was becoming impalpable. The camping trip solidified whatever was going on between you two- even if it was nothing at all as of right now. Robert ensured you were at every meeting so you could give your two cents if it was needed; you were the brains and the empathy of the project. Gen. Groves admired you for it because no matter how steep the project was getting, you never once panicked or got in over your head. He also admired how you managed to keep your hands off Robert despite how you looked at him. And one day, he mentioned it to you.

“What’s the first thing you’re going to do when you get out of here?” Gen. Groves asked you one day during a field test.

“Oh, uh,” you hadn’t given it much thought, “I’m not sure. Probably continue lecturing.”

“No one special in your life you want to be with?” Groves asked, a kind smile on his face.

“Not really,” you mumbled sadly, your eyes glanced over at Robert, “Not yet, anyway.”

“Maybe once all of this is over, you can pursue them,” Groves suggested knowingly, “We’re so close now. It won’t be long.”

You nodded, seeing that he knew who was on your mind just by how he studied you, “Maybe.”

After all the hard work and growing sexual tension over the tedious years at Los Alamos, the bubble separating you and Robert finally burst the morning of the Trinity Test. The test was a success, and Robert was basking in the afterglow. Everything from getting his hand shaken to being carried by the crowd of excited and ecstatic workers- it brought him some relief. There’s always sunshine before the rain.

You invited Robert over to your quaint house on the outskirts of Los Alamos for your nightly glass of wine, but this time it was heavier. It was more meaningful because you finally accomplished what you’d been working so hard for. When Robert sat next to you on the chaise next to the fireplace, his leg touched yours. The sexual energy was like a thick, wet blanket. You took large gulps of your wine as Robert’s eyes stared into yours, his glass pressed to his lips with slower sips.

“I can’t believe it’s all over,” you shook your head.

“Me either.”

“What do we do now? What’s life after this going to be like?”

“I’m not sure about that,” Robert had set his wine down on the floor, “But I’m sure about something else.”

“And what’s that?” you asked, polishing off your drink.

“You.”

You slowly sat back up after putting your empty glass on the floor by your feet, “Me?”

“Yes,” Robert paused, “Ever since I met you, I’ve wanted you in ways I can’t explain. And I can usually explain anything.”

You chuckled at that, nodding in agreement, “That you can.”

Robert leaned in, and your smile faltered. His hand reached up to touch your cheek gently, his thumb pushing some of your hair out of the way. Your eyes fluttered shut as you waited with bated breath for Robert to finally, finally kiss you. It had been years of waiting now. And the second his lips pressed to yours, all that time seemed to drift away. There was an explosion in your chest at the feeling of Robert pressing against you on the chaise, pushing you down onto its cushions. His coat and tie have long since been discarded, so all you have to do is worry at the buttons of his shirt with your shaking fingers. Eventually, you get the shirt opened and off his slender frame as it hovered over you. Robert let his skillful tongue slip past your lips with ease, exploring every centimeter of your mouth. How you had longed for this moment.

“Need you, Robert,” you pulled away for air and sighed as his hands pushed up your legs and underneath your dress, “Always have.”

“I’m here, darling. I’m here now.”

Robert shoved the skirt of your dress over your hips and stomach, revealing your slowly soaking white and dainty underwear. He hummed in satisfaction when his finger circled the wet spot at your entrance, causing a moan to leave your lips.

“Eager, are we?” he teased, pulling down your underwear without hesitation.

“Yes,” you said bravely, “Now, nothing fancy tonight. We have plenty of time for other things, but for now, I need you inside me.”

“Alright then,” Robert chuckles, hastily unbuckling his slacks before pushing them far enough down his legs to be comfortable.

He glided his tip along your slickness, gathering all he could to push inside you with less friction. You whined at the contact, a wanton moan escaping you suddenly as he moved into you at a patient pace. But you were anything but patient, especially at this point. You pushed your hips, causing Robert to enter you further, to which he let out a delicious groan. His hands gripped your sides intensely, sure to leave bruises tomorrow. He buried his face in your neck, his teeth baring down into the skin as he felt you suck his cock in.

“Wanted- needed this for so long,” Robert whispered in your ear as his tip finally brushed against your insides.

“God, me too,” you cried out when he slowly pulled back out and then slammed back into you, “Fuck.”

“Such a dirty mouth,” Robert tutted playfully, to which you flashed him a smile, moving your hips to wiggle him further inside you.

Robert had thrust himself into you again, this time a little faster than the last. He kept doing this until he had a steady rhythm, lifting your legs to put on his shoulders to get a better angle. You growled at the sensation of him hitting your cervix, and your hands scratched down his back. Robert picked up speed, almost making the chaise scoot on the floor. He was fucking you like mad, and you were taking every second of it like his cock was water and you were thirsting in the desert. In this situation, the figure of speech wasn’t too far from the truth. The feeling of him repeatedly steering into your stomach made you nearly squeal from pleasure. Robert presses your thighs to your shoulders, the undersides of them against his chest. You were a mess, moaning like a whore and gripping Robert as if you blinked hard enough, he’d disappear.

“Taking me like such a good girl,” Robert grunted, moving a hand to your cunt to swipe at your clit in time with his thrusts.

You tossed your head back, crying out at the sensation. No one had ever fucked you with such vigor and passion. You felt that growing bubble in your gut, expecting it to burst any second.

“Cum in me,” you demanded, “Need to feel you.”

Robert laughed breathlessly at you, “Are you sure?”

“Certain.”

And as if he weren’t going fast enough, he pulled out, flipped you over, and took you from behind even faster than before. Robert pushed your cheek into the chaise cushion, watching you as you side-eyed him with utmost pleasure. You could feel yourself clenching around him, your orgasm creeping up. Robert pushed your lower back down as far as it’d go, your stomach flush with the material of the chaise underneath you. Your ass being in the air caused Robert to hit a new spot inside you, sending you reeling and spilling over the edge. As your cunt suffocated his cock with its walls, Robert followed your release with his own. His hot cum filled you up with warmth, your hips still bouncing against him. Robert panted from behind you, slowly pulling himself out of your now-dripping pussy.

You rolled back onto your back, now facing Robert, “That was… wow,” you exhaled.

“I concur,” Robert joked, sitting back and pulling you onto his lap.

You hummed in exhaustion, blissed out as you hung your head on his shoulder.

“Want to stay?” you asked tiredly, eyeing the now-spilled remainder of wine Robert had placed on the floor earlier. You’d worry about it tomorrow.

“I’d love to,” Robert muttered into your ear, kissing it before picking you up off his lap.

The rest of your night is spent watching Robert study you as you lay beside each other in bed. He took you in as if he was seeing you in a new perspective- and he was. Robert was as curious about you as he was about the world and how it worked. Except now, he had to worry about not destroying you like he had the world.

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