Work Text:
Rui's always been the meticulous type when it comes to his inventions.
He gets fixated on the data, noting down all of his findings like mad. It's a habit of his that his parents have always encouraged, pleased to see their one and only child get so engrossed in his own genius, sparked partially by their own shared influence on him.
Rui would start small, building small machines out of scrap borrowed from his dad's collection of spare parts. They were only low-level devices, made to make his life a little easier like a remote that allowed him to turn all the lights on and off from wherever he was in his house at his own will, or a small robot that cleaned up all the crumbs in his bedroom before his parents had the chance to scold him about them.
He has pages upon pages full of notes about his inventions – all transferred into mostly neat, organized folders on his computer – and the numerous observations he's seen on every single one. How they work, how he went about maintaining them, how they interact with actual people outside of Rui himself–
"Kamishiro."
Rui glances up from his notebook. His gaze meets Akito's– though it's only for a fleeting moment. His boyfriend immediately closes his eyes, letting out a sound that sits deliciously between a moan and a sob.
"Yes, my love?"
"I– this is too much," Akito cries out. Tears streak down his cheeks. Rui makes sure to note that down too: subject started crying after his third orgasm, shows no signs of stopping even after his fifth. Change in position has had a profound effect on the subject's responses. "Please, please, I can't. No more, n-no more–!"
Rui tsks gently. "Don't say that. You're doing so well, Shinonome. Do you think you can hold out for just a few more minutes? For my sake?"
"You said that the last fucking time–!"
Whatever scathing comment Akito intends to throw his way quickly dies in his throat, as another string of broken moans tumble out of his boyfriend's mouth. He's certainly gotten a lot more vocal with every orgasm too. Rui has that written down too, his penmanship becoming darker and more rough from start to finish too. It's hard not to push pencil into paper so harshly. Akito's a better test subject than he could've ever imagined.
Which is to say, he'd spent the better half of a year imagining it…and then a couple few months wondering just how to pose the question to his boyfriend once they actually got together.
Akito sits before him, propped up on his workshop bed. The dildo wired to Rui's machine continues to thrust in and out of his boyfriend at a punishing pace. It shows no signs of slowing down as it pistons into Akito. His hands are tied behind his back at the wrist, effectively forcing Akito in place as he gives Rui a good show.
He'd tried multiple positions already, currently having moved onto watching Akito on top of his machine, riding the dildo like he was practically made for it.
And maybe he was. Rui's created plenty of inventions geared towards pleasure before, most of them during the period where he was living a much lonelier, forlorn life during middle school. He'd yearned so badly for intimacy and human connection back then. He wanted to make inventions that could make people outside of himself happy.
Wonderland x Showtime had proved to him that he could do just that without compromising his own ideals. They'd saved him.
And then came along Shinonome Akito, his grumpy yet cute junior. From the moment he'd first laid eyes on Akito, staring at him and Tsukasa like the Weird Wombo Combo had grown a pair of second heads, Rui had been enamored with him. If anyone was going to change his life and the direction of his inventions, it was going to be him. It had to be Akito.
He slows down the machine for a few seconds, giving Akito time to breathe. "Ah– Kamishiro…?" His boyfriend looks up at him, tears budding at the corners of his eyes. He looks at Rui as if he's his savior, and not the other way round.
Akito sinks down on the makeshift cock of his own volition. His mobility is limited, but he still desperately chases the pleasure his boyfriend's invention was granting him, as overwhelming as it is.
"Someone's enjoying themselves," Rui chuckles, fondly. He circles a few of the notes on his page, most notably "subject's gaze grows more intense with every orgasm."
"Aren't," Akito gasps, struggling to catch his breath. "Aren't you gonna…?"
"Aren't I going to what?" Rui asks. His eyes widen with intrigue, knowing fully well what Akito desires. He's usually never the type to beg. If Akito wants something, he works hard for it. His rationale and work ethic is one of the many reasons why Rui's interest in him had grown into full on infatuation.
As expected, instead of grovelling, Akito lets out a whine. He tries to push himself down on the machine himself, though it's a needy imitation of the pleasure Rui's invention was giving him.
Rui knows he needs to maintain his composure. What sort of inventor abandons his work in the pursuit of menial desires? He'd be doing himself and Akito, who had given up his free time just to help him today, a complete disservice. At the same time, a moan slips from Akito's throat as he tries to angle the slow-moving cock towards his sweet spot. Like it's something he wants. Like it's something he needs.
Click!
With one push of a button, the machine picks up the pace again, swiftly shifting into something brutal. Akito's eyes widen, his body practically jolting with the sheer force of the cock pistoning into him. Rui observes the immediate change in body language and expression from Akito, to which he notes this down too.
"Oh, fuck," Akito gasps, before cutting himself off with a broken moan. With his limited mobility, he manages to spread his legs, parting them enough for the dildo to thrust into him deeper. His thighs shudder and shake, overstimulated but still desperate for more. "Yes, Kamishiro– right there, fuck– right there–!"
Over and over again, the machine pounds into Akito, angled directly towards the spot that makes his boyfriend sees stars. He's oversensitive, his prostate abused and strung out from how long he'd been getting fucked for, with Rui taking down every last detail of the ordeal.
He's a real sight for sore eyes. The inventor in Rui thinks that Akito is an amazing test subject, awfully reactive and always gives interesting responses. The romanticist in Rui knows that Akito is the hottest boy he'd ever had the pleasure of setting eyes on, with every noise he makes going straight to Rui's cock.
Both sides of him want more. He wants to reach out to touch Akito, testing the boy's limits for himself. Just how far is Akito willing to take this for him?
Rui stands up, making his way over to the bed, notebook in hand. For a moment, he swears he catches sight of anticipation glinting in Akito's glazed over eyes.
Curiously, he brings a hand up to Akito's bare chest. His nipples, rosy and hard, have been untouched this entire time. It would be a disservice, as both an inventor and Akito's partner, not to test his hypothesis.
With a tenative flick of his wrist, he brushes a finger against Akito's right nipple.
Akito is quick to cry out, a loud "ah–!" being ripped from his throat. "Kamishiro, I– holy shit, more." Rui can't help but grin. Subject's chest has grown more sensitive from disuse. Must enact a separate test to see if the subject can orgasm from his chest alone at a later date.
It means a lot to hear Akito beg for more as well. He wants more of this. He wants more of Rui. When the inventor pulls his hand away from Akito's chest, his boyfriend practically wails, the sound akin to rejection.
"I'm here," Rui finds himself murmuring. "How much more do you want, my love?"
"More," Akito repeats. He's too caught up in the throes of overstimulation to form much in the way of coherent thoughts, only managing out a sobbed, "Kamishiro–"
Rui sets his notebook aside, bringing his other hand down to wrap around Akito's cock. Even an inventor isn't immune to a little field work every now and then. It serves to urge Akito on more, as his boyfriend immediately ruts into Rui's fist with shameless abandon.
"You're so sensitive," Rui hums, pleased with himself. "I wonder how many orgasms it took. You were losing your composure by the tailend of the second one, did you know? You started crying in the middle of the third. Do you remember any of those, Shinonome? Or are you too far gone?"
Akito mewls, the sound raw and broken coming from the depths of his throat. Rui keeps his hand where it is, letting Akito fuck into his fist whilst the dildo makes work of stretching his insides. Akito chases release like it could save him, like a dog chasing after a bone, moving his hips in time with the machine.
His dick leaks against Rui's palm, desperate and begging for release.
"So good," Rui murmurs. "Do you think you can cum one more time for me, love? You've been perfect for me so far. My perfect test subject, and my perfect boy." He brings his thumb up, swiping it across Akito's tip. He yowls, shaking in Rui's grasp.
In lieu of a response, another string of broken moans fall from Akito's lips. Something in his boyfriend finally snaps. For the sixth time that day, Akito cries out, spilling over Rui's clenched fist. His body shakes through his climax, ropes of white cascading and painting Rui's bedsheets in the process too.
It's everything Akito could've ever wanted. He'd asked for more, and Rui had been more than happy to give it to him. He'd give Akito anything – all his boyfriend has to do is ask. He's always been a bit of a romanticist like that.
Though, Rui is sure not to neglect the inventor in him as well.
Even as Akito cries out, his voice cracking from overuse, the machine doesn't stop.
"Good boy," Rui whispers, his fist still wrapped snugly around his boyfriend's leaking cock. "I know I said one more…but you're so gorgeous. Mind if I request something rather selfish, Shinonome?"
He brings his other hand down to Akito's thigh, carefully prying his legs even farther apart. Rui delights in the sob he receives, and how eagerly Akito chases his touch. "It hurts, please–" Akito cries, though he knows his partner's pain tolerance exceptionally well. Rui has extensive notes about it – and about Akito in general – all jotted down between two notebooks hidden and stashed away in his bedroom drawer.
"I know, love," he shushes him, softly. "Just one more. Could you say my name?"
"K–Kamishiro?"
"Not that. That's what you call me around everyone else," Rui says. "It's just the two of us. No audience, no fanfare…just you and me, Akito. Grant this inventor's selfish wish, please?" He lets Akito buck into his fist, his own cock straining in his pants at how sweetly his boyfriend moans for him. His sobs fills the workshop, mingling with the rhythmic sound of the machine pistoning into him.
In the midst of the machine's noises and the continuous wet sounds that join the machine in tandem, Akito moans, "Ah– Rui. Please, 'm gonna break, Rui–"
Rui isn't sure when Akito's seventh orgasm ends and when his eighth starts. The dildo burrows deep inside of him, carving a place inside of Akito. It may not be Rui's cock, but it's one of Rui's personalized inventions made just for him. Rui's blood, sweat and tears went into it, crafting a machine out of sheer love for Akito.
His love had finally managed to reach someone else, and make them happy. Just like he'd always wanted.
Click!
Tears streak down Akito's cheeks. Slowly, the thrusts start to slow down, until they've come to a complete stop. It leaves Akito heaving, twitching in Rui's grasp as the inventor carefully eases his partner off the toy.
Between gasps and trembling breaths, Akito manages out a quiet, "one last time my ass, Rui."
"My bad," Rui hums, holding his boyfriend close. Akito's entire body is shaking, though he hugs himself as closely to Rui as possibly. "You were just responding to the machine so well. The amount of data you've helped me collect today…I'm very thankful, my love."
His boyfriend looks like a masterpiece, delectably ruined and far gone. Rui thinks he looks ethreal like this. His darling boyfriend, shuddering and shaking, completely submitting himself to Rui's machine and his selfish requests.
"I never thought I'd be so jealous of one of my own machines before," Rui chuckles. He brings a hand down to Akito's rim, gently circling it with his thumb. Akito moans on instinct, burying his face in Rui's shirt. "You were taking it so well."
"Shut the fuck up. I hate you," Akito murmurs, though it lacks his usual bite. Akito moves his hips back, as if trying to get Rui to slip up, chasing his boyfriend's touch.
"I'm sure you do." Rui leans in, pressing a kiss to Akito's cheek. His cock is still hard, straining hard in his pants, begging to be dealt with. "I won't ask you for anything else tonight, Akito. You already granted me what I wanted, you see."
Akito clicks his tongue. He brings a hand to Rui's crotch, palming him through his pants. "C'mon," he whines.
"Ah– Akito."
"Rui."
When his boyfriend pulls away from his chest, he finds Akito staring at him with an expression so determined, Rui could melt. Even with tears running down his cheeks, hair mussed and cheeks flushed, Shinonome Akito is still the perfect picture of steadfast, unwillable confidence.
With a chuckle, Rui says, "you're too good to me, Akito. Just give me a second to put my notebook away, alright?"
"Huh? Don't…you need that for your notes?"
"I'm not taking any notes for this round," he whispers. "If I'm going to fuck you directly, it'll be as your lover. You deserve to be treated as such, my love."