Work Text:
Sento stared at the computer screen, having been lost in his thoughts for the better part of an hour.
He heard murmurs from the bedroom adjoining his strange basement laboratory, voices that interrupted his train of thought.
He tried to tune the voices out, rearranging the Lagrangian in his head. Some sort of form to stabilize Hazard…
“Huh!?” Misora exclaimed, not really a word but the sound poked through the barrier Sento tried to erect.
He stood up, rounding the corner. “Man, come on, I’m trying to work over here…” he whined, running his fingers through his hair. As he took a step forward, he stopped, realizing that the trio of Banjou, Misora, and Sawa were all in a circle, staring at him. Banjou and Sawa grinned in a way that made Sento regret scolding the group.
“Whatever it is, no.” He crossed his arms, turning away.
Banjou came forward, placing his hand on Sento’s shoulder. “Sento..” The physicist threw the hand off his shoulder, not enjoying the pleading tone.
“Musclebrain. I already told you, no.” Banjou shook his head, frustrated by his partner’s demeanor.
“Hey, come on, man. Don’t you think you should show a little appreciation to the three who saved your life?” The fighter pleaded.
Sento turned around, sighing and uncrossing his arms.
It was not long ago that, thanks to the three of them, he had not been consumed by Hazard. Misora would have been forced to flip the kill-switch and…
“Alright, alright, what?” He leaned against a desk, feigning nonchalance.
Sawa stepped forward. “Take Misora on a date.”
The bold declaration caused a thick silence to form in the air. Sento stared, blankly. What kind of a joke was this? Despite repelling Hokuto, Seito had declared war. The country was ravaged. This was no time to be thinking about this sort of thing.
“What are you talking about?” Sento asked, face curled in confusion. He looked over at Misora, who seemed to be bashfully avoiding eye contact.
Banjou hit Sento on the shoulder, hard enough to annoy him. “C’mon, man.” His obnoxious partner said no more, but he didn’t need to. The message was clear.
“Well, I was planning on stretching my legs. Let’s go.” He slipped on his coat as Misora exploded with excitement. Sento sighed and sat down as she grabbed her make-up, preparing to doll herself up.
Sawa bowed to Sento as her and Banjou exited. “I’m taking Banjou and Kazumin to look into a couple of leads I have about this whole Seito thing. We probably won’t be back until it’s late.” Sento looked at her quizzically as she winked and proceeded up the stairs. What the hell had gotten into all of them?
After Misora dressed herself in a properly adorable outfit, the two of them set off.
It mostly was just a prolonged walk with a stop for rations on the way. All entertainment was on pause in the war-torn state. They sat on a bench, overlooking the town.
“I’ll get it back.” Sento proclaimed. “A town where a cute girl like you can go on the date of her dreams.” He smiled at her.
She shoved him playfully. “Come on, where did you get that, a harem anime?” Her cheeks were a bright red, or was that just the blush she had applied?
The two of them got back to the cafe after a couple of hours. “Satisfied?” Sento asked, removing his coat.
“I had a nice time.” She said, smiling. Sento began to walk past her, back to his research. She grabbed his wrist as he stepped past. The scientist stopped on his heel and spun around, facing the girl.
“What?” He was beginning to get annoyed. If he didn’t find a way to manage the forbidden item soon, it would be a problem…
She reached her hand up, her palm against Sento’s jaw, fingers grazing his hair, thumb on his cheek. Sento’s eyes lowered, a frown on his face.
“I think you should save that for someone you truly want to be with.” He muttered.
Misora was an adorable girl that shined so brightly. She was sheltered, innocent, and naive. It wasn’t right for him to steal away her first kiss.
The owner’s words echoed in his mind. He was just a weapon, not really a person.
Yet her hand stayed on his cheek and her eyes stayed locked on his.
He bashfully met her gaze as her fingers pulled him down so that their faces could meet. His resistance faded and their eyes closed as her lips met his, tenderly grazing one another.
Sento pulled away as she pushed her lips deeper.
“Misora, the thing is… Banjou & I…” Sento didn’t know how to word their relationship but he knew that they had a connection. Misora smiled.
“I know. He said it’s okay.” The sly grin on her face made Sento feel thoroughly beat.
“How did you..?” Sento groaned.
“Oh, come on, did you really think I wouldn’t wake up? ‘Banjou, take off your pants, come on, hurry.” She seemed to relish mimicking Sento’s hushed tone.
“I was checking for side effects of the Sclash Driver!” Sento’s voice cracked with the last word, causing him to blush.
Misora giggled. “Banjou’s okay with it. I’m okay with it. If you’re okay with it, what’s the problem?”
Sento’s earlier self-doubt was replaced with a stirring in his chest that the tender kiss had awoken. He nodded and leaned back in, meeting her lips.
The two of them pressed their lips together, Misora aggressively wrapping hers around Sento’s bottom lip.
It was not long before she pushed her tongue into his mouth, jumping up into his arms. Sento gasped as her weight fell onto him, barely catching her.
“Heavy..” he groaned as her lips retreated temporarily. She pouted, and he felt something hard press into his hand.
It was the Gorilla bottle. This was a use-case he had not considered. He shook the bottle, and found a redoubling of strength in his arms.
He wrapped his arms around Misora, pulling her closer, causing their chests to press together.
Slowly, he walked forward, then pressed the girl against the nearby pillar, pressing their bodies together tightly.
Misora gasped as the pressure mounted.
Sento’s body reacted, a warmth in his groin.
With her body firmly braced against his, he grabbed her wrists, pinning them above her head.
It was him on the offensive now, as Misora panted softly into their kisses, Sento pushed his hips against hers.
After about a minute, the last of the dregs from the Gorilla bottle had left him and his legs began to feel strained as he supported both of their weights.
He embraced her and slowly let her down. Misora had a grin on her face as the two disentangled. “Let’s go downstairs.” She commanded, and he followed.
The pair found themselves in front of the bed and Misora shoved Sento onto the mattress.
He sat up, staring at the girl shaking the Gorilla bottle she had apparently misappropriated from him.
“Ah, when did you… that’s dangerous, Misora, you shouldn’t use that.” The essence may be too much for the frail girl, he worried.
She crawled onto the bed, straddling Sento, this time her hands wrapped around his wrists, pinning him down to the bed, hands over his head.
The flustered physicist gasped, feeling light-headed as she pressed her tongue into his mouth.
He had not guessed that he would find himself in this situation with the girl who spent most of her time sleeping, but the strength persisted, his wrists unable to break free.
Her lips pulled away, a bit of spit dripping from her tongue onto his lip.
“You like to struggle?” Her voice was low, it felt erotic in a way Sento had not seen from her before.
He groaned, words unable to find their way out from his throat.
Misora giggled as his wrists continued to rotate uselessly under her grasp.
The dizziness that swirled in Sento’s mind was not a sensation he had experienced before.
Submission.
It was different to being beaten by an opponent. He was surrendering, voluntarily, into this vulnerable position.
He nodded slightly, finally managing a response to her question.
She leaned forward, pushing her lips against his ear. “Good boy. Keep struggling for me.”
Her lips and tongue began to work the outside of his ear, erotic noise drowning out everything else. It was as though everything running through his brain was being replaced by the sound swelling in his ear and the shivers her tongue sent running down his spine.
His wrists, bereft of strength, didn’t even put up a fight against the dwindling strength coursing through the girl mounting him.
Her knee found its way between Sento’s legs, pushing up into him. Shudders reverberated as she grinded against his cock.
“Mmmmisora,” the scientist whimpered. The idol sat up, discarding her dress with a single motion. Sento turned his head, drinking in the sight.
Despite living under the same roof for a year, he had never seen her in this state of exposure. His eyes traced the curves of her hips, the way her breasts sat. Misora chuckled awkwardly. “You’re getting the same look in your eyes as when I purify a bottle.” She muttered, embarrassed.
Sento could feel his cowlick stood up. He was certainly enchanted by the possibilities laid bare before him. She dismounted him, nodding at him to follow suite. He removed his sweater and jeans and the two were face to face, stripped to their underwear.
They both awkwardly met one another’s gaze as their hands reflexively covered themselves.
“So…” they both started. They laughed.
“You first.” Sento said, smiling.
Misora stood up, moving her arms out of the way. Sento noticed a small bulge in her panties.
“Ah,” was all Sento said for a moment, “well, I’m sort of in the same boat. Guess it’s good Katsuragi got the work started for me.”
Misora then noticed the scars across Sento’s chest. More laughter erupted between the two.
After discarding their underwear, they both took a moment to bask in the sight of one another.
Misora was barely familiar with what a “female” anatomy would look like, given the lack of hers, but she was surprised by the way Sento’s clit, no, cock stood hard, at least a couple inches. Meanwhile, Sento was surprised by the lack of reaction from Misora’s lower half. It seemed completely soft.
They approached one another, embracing once more, this time Sento straddling Misora as they collapsed onto the bed together.
“Your body… it’s a wonderful construction.” Sento said, struggling to find the words.
Misora chuckled. “You have a very nice body too, Sento.” The two sat for a moment, burning the sight of one another into each’s memory.
Sento then lowered his hips, his cock pressed against hers. He began to grind himself against her, his sparse juices lubricating the sliding motion.
Misora gasped as her cock was enveloped in pleasure.
Sento moaned softly as his partner’s hands grabbed onto his hips, shoving him down against her shaft.
After a couple of minutes, her shaft had swelled up. Sento smiled in satisfaction. He lowered himself off of her and grabbed her cock, causing the girl to groan wildly. The stimulation was almost too much for her to handle, but Sento delicately released her before climax enveloped her.
Misora’s face was one of frustration.
“Why…?” she begged. Sento had a cocky smile on.
She shouldn’t have let him get on top, she cursed to herself.
“If you’re releasing it anywhere, I want it inside.” The two both seemed shocked at the admission and stared at one another.
“I mean, given the hormones, it’s not as though there’s much risk of any complications…” Sento began to mutter.
Misora shushed him. “Be a good boy and take it, then.” Sento throbbed in response, raising his hips up and pointing her shaft upward.
He took in the size of her shaft. It wasn’t exactly big, but it wasn’t nothing either. Eleven or twelve centimeters, given the size that swelled between his fingers.
Lowering his hips, he shuddered as the head pressed against his quivering entrance.
Misora grinned, eager to take the initiative back. She pistoned her hips up slightly, causing most of her length to enter suddenly, causing Sento to gasp.
Her hands restrained his hips, keeping them from rising up. Her hips continued to thrust, angling upwards.
Sento began to moan involuntarily as his cock and pussy twitched in delight, on the verge of climax. Despite the assumed inexperience of the girl, she seemed to know that driving her length upward instead of deeper would drive him crazy. His hands wrapped around Misora’s.
“Cumming…” he announced, weakly. Misora gasped as his insides tightened up and dug her nails into his hips, driving him down onto her.
“Me too,” the girl whined as she began to pump her cock into him, electric sensations dancing through her nerves. As Sento felt her cock swell and her sparse seed pump into him, his body began to react harder.
“Fuck, again… I’m cumming…” The genius could barely find the words as Misora took a hand from his hips and pushed her thumb against his cock.
Sento yelped in pleasure as his body gave, his hips falling against Misora’s.
Sento felt his hole continuously pulse against the shaft that had penetrated him far better than he ever could have hoped.
The idol moaned as her cock continued to spasm, watery fluid leaking from her tip.
As Sento collapsed onto Misora, the two embraced, melting against one another.
Misora’s breath came in gasps.
“Next time, you’ll actually be the one bouncing on it, bunny.” She smiled as she teased him.
Sento gave a dishonest sigh of exasperation. “No, no, this was a one-time thing, dummy.” He flicked her on the forehead as he began to dismount her.
Misora turned away, grinning.
“Fine, fine, I’ll just be sure to tell everyone the things I overhear when you and Banjou share the bed.”
Sento’s head snapped back. “Seriously, how much have you been hearing this whole time?”
Misora tilted her head slightly, a devious smile on her face, “One night a week, we’ll be sharing the bed.”
Sento once more feigned a sigh. “Sure, sure. Just don’t let it get to your head, little one.”
The two continued arguing, aggravating one another, until eventually, about half an hour later, a shove onto the bed resulted in the two of them once more becoming a Best Match.