Shuichi grinned to himself as he drove down the street, the warm sun gleaming on his skin through the windshield. He couldn't wait to surprise his husband when he arrived home early from work. He'd been given the day off due to a situation in the office, granting Shuichi the time to enjoy Rantaro's company, something that was difficult with the two of them having demanding jobs.
Approaching the home he shared with his husband of four years, Shuichi noticed an odd sports car parked in the driveway. Shrugging it off, Shuichi parked his car beside it and grabbed his belongings, not thinking too much of the strange vehicle. A close friend of theirs, Iruma Miu, loved to spend her money and show off her wealth, so Shuichi assumed a few of their friends may be visiting.
Unlocking the front door, Shuichi placed his bag and jacket on the racks next to the entrance, slipping off his shoes. Frowning, Shuichi noticed an unfamiliar coat and pair of sneakers accompanying his and Rantaro's clothes. Again assuming friends were visiting, Shuichi sighed and pushed any negative assumptions out of his mind.
Searching through his shoulder bag, Shuichi pulled out his leftover lunch and made his way to the kitchen, throwing it into the fridge for later. As he turned, his eyes skimmed over a shining object lying on the grey marble counter. Beside the object were Rantaro's cell phone and house keys, intriguing the blue-haired male. Shuichi approached and picked up the object, his heart dropping as he held a wedding ring between his fingers. He knew exactly what it was, he'd been the one to slip it onto Rantaro's finger at their wedding.
Laughter erupted from upstairs. Shuichi frowned, noticing it sounded like two people rather than a group of friends. He recognised all the signs, piecing them together to form a conclusion based on evidence, exactly as he did in his career.
Tears dripped down Shuichi's cheeks before he wiped them away and huffed, placing the ring back on the counter. "Innocent until proven guilty," Shuichi reminded himself, taking a deep breath to calm his rapid heartbeat. Sneaking through the house without creating the faintest of sounds, Shuichi approached the closed bedroom door.
He gripped the handle, twisting it until the door swung open with a creak. Shuichi's heart dropped, despair swirling behind his teary eyes. Before the detective was Rantaro, in bed with another who had purple, wavy hair. "You... You're cheating on me?" Shuichi whispered, his fists clenching as a variety of emotions surged through his mind.
"W-Wait, Dear, it's not what it looks like!" Rantaro stuttered. Shuichi noticed the male's bare chest as he sat up, the blanket falling from his body. The person besides his husband gasped and threw on a shirt hanging on the bedpost.
"I wasn't enough for you? Was I... What did I do?!" Shuichi screamed, tears pouring to the ground. Snatching his hand, Shuichi ripped off his cold, metal ring and chucked it at Rantaro with all the strength he could muster.
"You were married this whole time?!" The purplette shouted, turning to Rantaro and slapping the green-haired cheater.
"Whole... Time...?" Shuichi whispered. "How long have you been going behind my back with them?!" He shouted, gesturing to the stranger in their shared bed. "F-Forget it, w-we're fucking done!"
As the male continued to cry and hyperventilate, Shuichi turned and ran from the bedroom. He continued to run until he'd collected his car keys and mobile. Soon, Shuichi found himself in his car, the engine running as he cried, leaning on the top of the steering wheel. My entire life, I've loved him for my entire life and this is how he repays me? Four years... How much of it was a lie?
"Oi, knock knock," a strange voice chuckled from beside the car. Shuichi jumped as the driver's door opened, a familiar purplette bending over to make eye contact with him. The purplette grinned before sighing and stepping back. "I know you probably don't want to see me considering what you just found out... What we just found out... I'm so sorry, I can't begin to describe how sorry I am."
Shuichi stared at the male, the only noises coming from him were occasional sniffs and hiccups. He continued to stare at the stranger as they stared at the ground, playing with their fingers as they apologised. "If I'd known he was married I'd have never done anything with him. I'm not that type of person, even if I can be an asshole sometimes."
"It's fine, you don't need to apologise," Shuichi interrupted, his voice wavering. "You were tricked too, it's not your fault. I'm pissed off, yes, but in the end, he's the one who should pay, it's just easier to be mad at you I guess," Shuichi explained.
"So, are you mad at me or not?" The person frowned.
"No, yes, a little. God, I don't know how to feel!" Shuichi shouted, throwing his hands in the air. "I don't think I'm mad you at, I'm just pissed off at the situation?"
"Thank God..." The stranger mumbled before placing a bright grin on their face. "Alright, listen, I'm taking you somewhere to cheer you up!" Feeling them grab his wrist, Shuichi hesitated. "Come on, it's the least I could do as a homewrecker!"
"You're not a homewrecker, Rantaro's just a lying bitch," Shuichi sneered at his lap.
"Either way, you're not in a state to be driving! Come on, move that ass and get in my car," they groaned. Shuichi hesitated again, after all, he didn't even know the other person's name. All he knew was that person had just been in bed with his husband. I suppose my ex-husband now... "Listen, I'm driving you wherever you want to go and we can get drunk and tell everyone what a cunt your ex-husband is!"
"F-Fine... No getting drunk though, it's not even midday..." Shuichi muttered, leaving his car and locking it behind him.
"It's five in the afternoon somewhere!" The purplette laughed.
Entering the sports car, Shuichi glanced at the front door to the home which remained closed. "He's not tried to come after me or anything... Did he ever care?"
"Don't be stupid, he wouldn't have married you if he didn't! It's just, sometimes people make bad decisions or decisions they don't think through," the other muttered.
"If you two have been, uh, together as long as I assume, then he might've never loved me..."
"We were fooling around for almost a year and a half now..." The other sighed, beginning their drive down the street. Shuichi hummed, staring at his lap as the car revved beneath his seat. "Alright, what's your name?"
"Huh? He never mentioned me at all?" Shuichi questioned, turning to stare at the purplette's pale, solemn expression.
"Why would he? I'd told him how horrible infidelity is so he'd dare not mention anything of the sort. He told me he lived with a friend, that's the most I knew and I assume you're the supposed friend he was talking about."
"Right... Anyway, I'm Amami Shuichi..."
"No you're not," the other smirked.
"Huh? That is my name- Oh..." Shuichi nodded, catching on to what the other meant. "I'm Saihara Shuichi."
"Great! Nice to meet you Saihara, I'm Ouma Kokichi!" Ouma grinned, extending a hand to Shuichi which he shook. The male made Shiuchi feel happy, distracting him from the situation at hand. "I'm also your best friend!"
"Alright Best Friend, let's go buy lunch and do some retail therapy," Shuichi suggested. He laughed at the grin from Ouma who seemed ecstatic at the offer.

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90 Day Saioumami Challenge
FanfictionA collection of stories for Saihara Shuichi x Ouma Kokichi x Amami Rantaro. This ship doesn't have enough stories, so here are 90 more. Contains fluff, angst and smut stories. Any necessary trigger warnings will appear at the beginning of each stor...