Work Text:
"FUCK"
Luthor grips the sheets tightly and can't help but scream as the thick green cock begins to vibrate against his prostate. His white dress shirt, open and stained with precum, is ruined at this point, but that's a minor problem. The important thing is that he is naturally a genius, and this is one of the best ideas he's ever had.
Brainiac is pounding him with the perfect percentage of force/speed, enough to make it hurt later while still being pleasurable now, just as Luthor ordered. The Coluan doesn't even blink, just stares at him with deep annoyance as he thrusts inside him. Luthor returns his gaze with all the arrogance he can muster in a smile as he pants, and allows himself a brief laugh when Brainiac's frown deepens as a result.
“This act should have been over ten minutes ago according to the standards of time in the intercourse of an average human” Brainiac says in an apathetic voice.
“I've never been average, Brainiac, and if you really want to finish this as soon as possible” Luthor exhales sharply before continuing, “I recommend you use some other idea”
“You forbade me to masturbate you” he replies bitterly. “You're forcing me to be your sex object with no apparent end”
“Ah ah,” Luthor corrects him and pushes himself closer to him. “I'm not forcing you. You're here because you want that Kryptonian city, and you're paying for it, so—damn it.” Brainiac pulls out completely and then enters with force several times. It takes Luthor a few seconds to regain his composure before speaking again. “This is a transaction”
“One I'm beginning to regret” Brainiac replies with frustrated acceptance. At this point, Luthor barely focuses on him but catches the slight shift from annoyance to curiosity in the alien's eyes. “Why this of all things? I dare ask.”
He can't really shrug in this position, but he tries anyway.
“Let's just say I got tired of the routine. I wanted a little change of pace” Brainiac stops pushing and floats above Luthor's neck with an inquisitive look. Lex sighs, enjoying the vibration inside his body. “Something to gain without the usual cumbersome process.”
“But you still wanted something elaborate” Brainiac replies understandingly, now moving closer to his face. His bright green eyes locked on Lex's. “And something to add to your ego.”
“Where's the fun in that if not?” Luthor snorts in his face before murmuring ‘finally’ into Brainiac's mouth before the other kisses him. At first, it's a minimal contact of lips to which the man does not respond, but Brainiac quickly seems to understand Luthor's refusal to kiss like schoolchildren and begins to kiss him seriously, so he kisses back. Despite having fulfilled most of his requests, such as taking off his clothes, until now the alien had been limiting his contact with him to the extent necessary, but he seems to have finally succumbed to the pressure of time, as was to be expected.
Of course, Luthor knows that he can't come just by stimulating his prostate; he had already proven this fact to himself before, but what really matters here is seeing how entertaining it can be to fuck Brainiac, forcing him to stoop to a “primitive mating system.” was another part of the experience. The arrogant alien was doing everything he could to please a human, no less, and Luthor was enjoying every sign of irritation from the Coluan (or every nanosecond).
Stealing Kandor and hiding it, planting a life bomb in the city if Brainiac decided to kill him, creating an environment with biological viruses in case of death, or using a keyword in case of betrayal and testing the limits of his body, all very entertaining. And as for the orgasm, that's the least of it. When he wants to come, he'll just masturbate, preferably on his partner's massive pecs.
Brainiac uses his grip on his knees to push the man's legs and tilt him even further back before pushing again. There is a satisfyingly deep thrust at the same moment that Brainiac's tongue begins to vibrate in his mouth and he feels his eyes roll back. He doesn't remember having such good sex in years, and he's probably never been so blatantly loud. Lex does a mental check to confirm that he has completely dismissed Mercy from his quarters and gives in to the urge to wrap his arms around the android.
Brainiac never closes his eyes, and he himself avoids doing so. When he pulls away to catch his breath, he notices that his partner seems more confused than anything else. The other slows the pace to something steady but gentle that steals a trembling sigh from him.
“How can I make you feel better?” Brainiac asks without questioning the arms around his shoulders, and Luthor likes that.
“Your vast knowledge should give you an idea.”
Brainiac doesn't respond, just narrows his eyes, examining Luthor. Lex smiles, smug and excited, watching his partner process what must be infinite terabytes of information. Finally, Brainiac speaks again.
“I will proceed to solve the problem then.”
And Luthor has less than a second to worry about that conclusion before being drawn into another long kiss. He lets out a pleased growl when the alien takes his nipples between his fingers, and he moans when he sends tiny bursts of electricity through them. A few seconds later, Brainiac stops his thrusting and focuses only on kissing his neck.
The millionaire is so drunk on endorphins that he doesn't notice when Brainiac breaks down most of the lower half of his own android body into nanobots until he feels his lower back lift with a sudden body beneath him. Or rather, when he looks closely, with the lower half of a body beneath him, the upper half of the alien is still on top of him, kissing his Adam's apple.
Luthor raises an eyebrow in a nonverbal question that Brainiac ignores, choosing to reenter his body. The question of ‘what the hell are you doing’ that he was going to ask becomes irrelevant when the thrusts begin and increase in speed again, now at a perfect angle. It is like having Brainiac in two positions at the same time, sex from the behind and stimulation from the front.
Vibrant, powerful, made him clench his teeth to stifle his screams and avoid alerting security. It feels as if release could come at any moment, but it doesn't. With each thrust he is wearing down his intention to prolong the situation any further. Brainiac's hands move down, caressing his abdomen, circling the area near his penis. Those hands are suggesting a touch that will never come because he himself forbade it, and Lex knows he has less than three minutes of patience before he touches himself. Brainiac had been surprisingly inventive in that area, but he is Lex Luthor, and he will endure at least ten more minutes.
He had thought Brainiac's plan was good, but it becomes clear to Luthor that it is actually flawless when his partner begins to whisper compliments in his ear. They are cheap, obviously designed to please the part of Lex's psyche that revels in flattery, and they work.
“You are truly an exceptional human being” “Your body is perfect” “Your warmth is pleasant”
“The only being I have ever copulated with”
Shit.
“Touch yourself, Lex”
Now Brainiac's voice has an artificial touch of breathlessness, and Lex wants to curse him for stacking the cards against him, but all that comes out is a desperate moan, his legs are trembling. Brainiac takes the man's hands and brings them to his broad chest, encouraging him to touch him there, and Lex gladly gives in. The bastard even puts on an almost pitiful expression that would look real to anyone but Luthor.
“Come where you want to do it”
Well, to hell with waiting.
It takes him exactly five seconds of masturbating to come with a scream that Superman may or may not have heard.
He sees stars.
When he has finished painting Brainiac's chest with semen, he drops his head back, completely exhausted. Every bone in his body aches, and Luthor knows he is smiling like an idiot as he tries to catch his breath. The alien disappears from his body and Lex's lower back with a murmur of ‘finally’ , and now he can see his partner over the whole thing again.
Brainiac looks with open disgust at the semen stain sliding between his pectorals, Luthor laughs with a broken voice. He feels deeply satisfied, the remnants of the post-orgasm settling peacefully in his limbs, and he closes his eyes for a few seconds.
When he finally manages to breathe steadily, he crosses his arms behind his head and looks at his partner again. Brainiac is now cleaning himself with the sheet and a disinfectant liquid of his own. A pity, really, he looked very good.
“How did you know I wanted to do that?” he asks curiously.
“You weren't exceptionally ‘subtle’ in your observation of my humanoid form”
Oh well.
“And where did you get the ideas?” Now that his neural connections are working again, he realizes that was creative. Very creative for someone like Brainiac, who focused primarily on probabilities and statistics. He must have created an amalgam of probable options using clinical data and human fantasies. “Erotic novels?”
“Not exactly” Luthor watches as his suit reappears on Brainiac's body, dressing him. “The best results were from a separate literary category called ‘fan fiction’”
Brainiac looks at him as if expecting some kind of follow-up question, but Luthor doesn't ask him what he read. He just frowns for a moment, then decides not to give it any importance. He gently reaches for the nightstand and pours himself a much-needed glass of whiskey.
“Very well.” He takes off his shirt and wipes the sweat from his forehead before standing up. He can feel every muscle in his body protesting, especially his lower body, but he ignores it as he takes a long drink. One of the best aspects of this event is the lack of secretions in it, nothing but lubricant and his own sweat. He can't say the same for his partner. “I am a man of my word and—”
“False.”
“And therefore I will deliver my part of the bargain” Luthor walks over to a table on the other side of the room and presses the edge. A mechanism appears in the middle and a platform rises with two things on it, a Coluan technology gun and a version of Kandor twice as small. Brainiac remains impassive as Luthor uses the gun to return the city to its previous size. He hands it to the android. “Here. It's been a pleasure doing business with you.”
Brainiac gives him a flat look that tells Luthor everything he thinks about his joke, but he doesn't care. Lex smiles and takes another sip. When he seems to have made sure that everything is correct with the city, the android allows himself a brief smile of triumph, and Brainiac's body begins to teleport from his feet.
Luthor plays with the glass in his hand and gives his guest a final wave. “We should do this again sometime”
Distractedly, he checks his mental agenda, already thinking about what he has to do today: an alibi so that no one suspects him of being responsible for the theft at the fortress, playing with the new Kryptonian technology he stole, a meeting in two hours, calling Mercy, taking an aspirin with a hot bath... “Although I don't think your false flattery will work next time” he adds with a smug smile.
The last thing he sees is Brainiac tilting his head in apparent confusion. “Nothing I said was false.” Then the other disappears completely.
Luthor feels his eyebrows rise, and he stands for a few seconds contemplating the empty space where Brainiac had been. When he feels a sudden heat rise to his cheeks, he drinks the entire glass in one gulp, mentally cursing the alien.