Osomatsu-san Oneshots

From the brothers view (Karamatsu x Sister! reader)

Oh boy😅

NSFW STARTS

-Jyushimatsu's POV-

I had finished practice early and decided to head home. When I entered the house I didn't give my usual declaration because I was tired. I sat down to take my shoes off and heard whispering voices. I glance at the shoes that remained and saw they belonged to y/n and Karamatsu. What are they whispering about? I thought as I got up and curiously walk over.

I slid the door open a crack and quietly take a look. I saw Karamatsu hugging y/n from behind and nuzzling into her neck.

"Can I borrow a kiss? I promise I'll give it back."

I tilt my head confused and cover my mouth in shock when he kissed her. They kept flirting with each other once he pulled away. Then he kissed her again while running a hand through her hair. What are they doing? No I know what they're doing so better question; why?

My eyes widen when Karamatsu gropes her yet y/n didn't pull away. She welcomed it. I shouldn't be watching this!...so why am I not doing or saying anything? Is it because of the shock? I glance down it's not because I'm turned on or anything, so why?

I was brought out of my thoughts when I heard a gasp from y/n and Karamatsu's voice saying "Don't lie to me darling~" I look up and blush lightly when I saw Karamatsu with his hand in her pants. I gulp nervously while watching the erotic scene unfold.

My blush increased when y/n moaned "ooh~ Karamatsu~ I think I'm gonna-ah~ I'm gonna..I'm gonna.." Karamatsu moved to whisper in her ear. I don't know what he said but she whined and arched her back. I suddenly had this gut feeling to go outside. So I did but caught a glimpse of Karamatsu laying y/n on the table before grinding up on her ass.

I left the house and ended up seeing my brothers, who were walking home. I rush over and greet them with a wide, but nervous, smile. "Hey niisans! Hey Todomatsu!" I greet and they say hello back before walking around me to head home. I walk with them "Hey how about the 5 of us go to Chibita's for a bit!" I suggest and they look at me.

"Maybe later Jyushimatsu. We're pretty tired." Osomatsu says and Todomatsu hums "we can go after we relax for a bit." They continue walking while Choromatsu stays back with me. "What's wrong? You seem very tense." He asks and I laugh nervously "yeah..it's um..well y/n and Karamatsu. I'm trying to stop them from entering the house." I made my explanation as vague as possible. Maybe he would just assume they're fighting. Though I saw Choromatsu's eyes widen slightly "what were they doing? What did you see? Be honest." He asks in a serious tone and I was surprised a little.

"...I saw them kissing and stuff..then it escalated...they apparently are intending to..um" I trail off and Choromatsu pales. "Okay...I think I have an idea..if we are lucky it'll work." I tilt my head and he cleared his throat. "Guys?" The others stop and turn to look at us. "Jyushimatsu says that y/n was tired and fell asleep in the living room." They nod "we'll have to be quiet then." Ichimatsu says turning to the pathway of our home.

"Or we could go somewhere for a bit so we don't accidentally wake her." Choromatsu suggests a little nervous. "We don't have to that we'll just keep our voices down and let her rest." Osomatsu says as the three of them walk up to the door. "Well, we shouldn't risk waking her. Let's just" I was cut off by Todomatsu "Are you guys okay?" He asks and we nod with nervous smiles.

"Are you sure? You guys are acting weird?" Osomatsu asks and we nod again. He shrugs and opens the door. Right as we step in there was a small yelp from the living room. Choromatsu and I looked at each other with knowing looks while the others look confused. Of course Osomatsu was the one who went up to the living room door and slid it open a little then I had and visible froze. Todomatsu looked he was going to ask what was wrong but something cut him off.

"Oh!~ K-Karamatsu!~"

The voice could easily be recognized as y/n's voice. The rest of us silently moved to see what caused it. Everyone's eyes widened, even mine and Choromatsu's, as we saw y/n bent over the table with Karamatsu fucking her. I advert my eyes and heard Ichimatsu mumble "Tch. Ew." while the other two just stare in shock like I was when I saw them kissing. This was more shocking. I could tell that their thoughts were going wild because of the situation.

What should we do? That's what they were thinking and, well, what could we do in this situation? It was a shocking situation that we didn't know how deal with.

Y/n then threw her head back with an almost silent moan. Karamatsu chuckled before laying his body on hers, turning her head to kiss her. "Oh!~ Karamatsu!~ I'm g-gonna cum!~" I glance at Choromatsu with wide eyes and he was adverting his eyes as well. Actually the only ones not adverting their eyes was Osomatsu and Ichimatsu.

"wait a moment~ I'm so close~ Ha!~ W-Would you allow m-me to c-cum inside~" he says and she whined "Y-Yes!~ But I c-can't hold b-back!~" I glance up for a second to see him flip her onto her back. "T-Try your best t-too d-darling. I'm really close~"

Then she turned her head towards. I tense up and she froze before turning back to Karamatsu while I again looked away.

"W-Wait K-Karamatsu Sto-Ah!~" She threw her head back with a moan cutting off her attempt to stop him. "K-Kara-Ah!~ W-Wait!" He groaned softly "I c-can't~ my h-hips c-can't stop moving!~ F-Fuck, I'm g-gonna cum!~" He cried out before kissing her roughly. She let out a muffled moan as her back arched and she gripped the table edge. A little bit later she shudders with a soft whine.

NSWF ENDS

I cover my face with my hands and heard Karamatsu's voice filled with fear as all he said was

"Oh.."

I saw Osomatsu's face contort to his serious face as he crossed his arms.

"You two have some serious explaining to do. Now."

To be continued in part 3; Explanation and Feelings