My beautiful sister-in-law who is only attached to me, and my childhood friend who just made her high school debut, barged into my house?

After Shota confirmed that Erika’s presence was no longer in his room, he let out a loud sigh and got up from his bed.

As he descended the stairs, he heard pitter pattering from below. Mio must’ve been doing something.

When I looked into the living room, I found pizza toast and café au lait with a lot of milk on the dining room table, both of which had gone completely cold. It was too much trouble to reheat them, so I decided to eat them as they were.

The onions and peppers were still wet from the time that had passed, but I was hungry, so I ate the toast in one gulp and drank the warm café au lait in one gulp.

Just as I was about to take the dishes to the sink, Mio came out of the hallway and spoke to me.

“Oh, you’re awake. Bring me the sheets for my futon. I won’t have a chance to wash them after school starts, so I want to wash them while I still can.”

“Oh, okay.”

“Throw them in the washing machine~.”

With that said, Mio, with the laundry basket in her arms, padded out to the garden.

She was wearing a sweatshirt and her hair was pulled up in a bun just like last night.  Since she came over so often even before she moved in, she seemed comfortable and at home.

Shota returned to his room, stripped off the sheets from his futon, thought it’d be a good idea to wash his nightgowns as well, and went to the washroom. Shota stopped in front of the door, cleared his throat and took a deep breath.

*Knock knock*

Naturally, there was no sign of anyone and no answer. In the first place, there should not have been any coincidences like last night. With this thought in mind, I slid  inside-

“Huh!?”

And then I froze.

It may be that I was too relaxed.

Placed haphazardly on the lid of the washing machine were two frilly pieces of undergarments that proudly adjusts the shape of a woman’s chest and prevents it from losing its shape.

But who would could have expected that there would be such things in such a conspicuous place.

One is pale blue.

Decorated with a pretty lace exuding off a fresh and girlish impression, both neat and elegant.

The other is black.

A red ribbon that subtly brings out cuteness, contrasting with the sex appeal of its’ entirety, perfect for producing the unique charm of a girl who is both an adult and a child.

Either way, it is something that Shota has never had much contact with, making him very aware of his current predicament.

Is this some kind of trap? Am I being tested? Isn’t it too cute? Isn’t the black one a little too outstretched?

Shota’s gaze was glued to the underwear, and while he was still staring dumbstruck, like a complete and utter dickhead, Mio suddenly came to his side and whispered in a strangely mysterious voice.

“Black is dangerous, isn’t it?”

“M-Mio!?”

“Even though I’m going to be a high school student soon, I guess it’s still too soon… But Eri-chan looks like an adult, so I can understand how you feel.”

Saying so, Mio nodded her head while picking up the bra.

So it seems the black one belongs to Erika.

This is absolutely outrageous behaviour as an older brother.

However, it might definitely suit the slender Erika. I’m in agony. If I had gone to the bathroom just a little earlier last night, I would have been able to find out. ”What the hell was I thinking?” I shook his head and tried his best to keep his tone of voice sullen. I say this without looking at the actual product.

“What’s that?”

“Ah, this one I bought to match my outfit.”

“That wasn’t what I meant!”

“Okay, but isn’t it cute? I thought it would be better to wear this on days with gym class… Ha! This is what you call it! It’s the so-called competition underwear!”

“What are you talking about, idiot? I mean, why do you have it there?”

“Well, I tried to wash them, but I didn’t have a laundry net.”

“A laundry net? I’m not sure if we even have on in the house.”

“Look, if you wash it as it is, the straps and other stuff will get tangled up. Ah, I don’t mind if mine and Sho-chan’s laundry are washed together, so don’t worry.”

“Yeah, yeah.”

“Well, it actually just occurred to me that if you wash them in the same machine, after they’ve been pressed against our private parts all day and gotten dirty, then get them mixed up, it’s practically sex.”

“The fuck are you on about?”

“Ow!”

I bonked Mio on the head as she was once again seriously talking about something stupid.

Mio showed off the tip of her tongue. I felt a little embarrassed and guilty about what I had seen, but it faded into such a familiar interaction. Honestly, it helped me a little.

“I’ll go and buy some laundry nets then. But where can I find some?”

“Well, at a hundred-yen store, a supermarket, or a drugstore?”

“They sell it at a lot of places. Ok then, I’m heading out.”

After saying that, Shota threw the sheets and nightgown into the washing machine and was about to leave the bathroom when a rather amused looking Mio called out to him.

“I see, you were looking at it quite intently, but which colour do you prefer, Sho-chan?”

“Hmm!? Who knows!?”

“Nihihi”

Being ridiculed, Shota’s face turned red as he rushed out the bathroom.