Osomatsu-San x Reader ONE SHOTS

The Weeping Guitar (Cheating!Karamatsu x Reader x Ichimatsu)

"I look at you all see the love there that's sleeping

While my guitar gently weeps..."

You'd known Karamatsu for as long as you could remember, so mutual trust was strong between the two of you. He promised you many things like happiness, eternal love, and to always keep you as his. He said he'd love you and only you. For the longest time, you believed him and would've never even second-guessed his promises. Karamatsu was just that trustworthy when it came to things like that. Or at least that's what you thought.

His brothers always told you stories of how he'd go to the bridge every day to scope out girls and had a reputation for flirting with any female he saw. But, Karamatsu insisted that he did but stopped once he started dating you. You knew for a fact he did stop and his brothers knew it too. But, they wouldn't drop what he did in the past and constantly warned you that he could be a player and turn his back on you in a second.

It didn't seem like something he would do.

That wasn't a Karamatsu type move.

He wouldn't.

Would he?

You didn't know for sure since you knew how he was before the two of you got together, but he seemed trustworthy enough. The two of you were dating for a long while compared to your previous relationships. With long relationships came strong reliance and you believed that to be so very true.

Like a normal day for you, you woke up and made your way to the Matsuno household, passing all the shops and restaurants on the way with a smile on your face. Visiting your boyfriend was the highlight of your day and you were exhilarated each time you'd get to visit. So, it wasn't a surprise that you practically sprinted to their home. Once you arrived, you, of course, knocked on the door, rocking your feet back in forth to rid of any excess energy you had.

It was typical for them to take a few seconds to open the door since the men often argued over who would answer the door. It was rather hilarious, really. Though, Karamatsu was usually the one to greet you since he always insisted it was his duty as your boyfriend.

"I look at the floor and I see it needs sweeping...

Still, my guitar gently weeps..."

This time, however, the door was opened by your boyfriend's polar opposite: Ichimatsu. Upon seeing your usual wide smile, a ping of guilt went off in his chest, his expression changing for a brief second. You didn't know why, but you still greeted the man as normal and proceeded inside the house.

As usual, it was rather messy since the boys never did much cleaning. Their poor mother had to endure all the chores on her own, so you'd occasionally pitch in to help her. You looked around the home seeing Osomatsu and Choromatsu playing Mahjong, Ichimatsu petting his cat, Jyushimatsu swinging his baseball bat around the house, Todomatsu was on his phone, and Karamatsu was-

Wait.

Where was Karamatsu?

"I don't know why nobody told you how to unfold your love..."

You made your way over to the fourth eldest who was seated in the corner and you took note that he visibly froze upon your arrival. This made you quirk a brow for a moment, but you brushed it off as nothing.

"Do you know where Kara is?" You questioned, confused as to why the man wasn't in the house when he said he was.

Ichimatsu averted his eyes, going a bit pale. "N-no. I don't care."