The end of April. On an afternoon during the weekend when everyone’s beloved Golden Week begins.

A message popped on my phone, and the sender was none other than Mitoma-san, she had messaged me through LINE.

「By the way, I want to return the jersey I borrowed from you, is it alright if I come to your house tonight?」

「Sure.」

It was a short exchange and I remembered that I indeed lent her something like that.

It was a rainy day, wasn’t it?

I had lent my room clothes to Mitoma-san who was completely drenched due to rain. I had already returned her clothes but the timing was not right so I haven’t gotten them back yet.

And then, it was discovered that her underwear was with me… I shouldn’t remember that, or rather, I finally forgot that certain event and those vivid memories came back to me in a flash.

“What am I thinking? I should have forgotten about that. I decided to trash that memory somewhere deep in my mind.”

I repeated those words and shook off the strange thoughts.

I am a man too, so it is not strange to have those lewd thoughts, but imagining the naked figure of my kouhai is something else.

Yeah…

But, in some way… it is incredibly erotic and good. I even researched illustrations of kouhai’s while being naked and wearing only an apron on their body.

Wait… have I been found out?

No way. What am I thinking? Mitoma-san would never think about something erotic like that. Well, there are times when I don’t know what she’s thinking, but Mitoma-san looks so pure.

[TL/N : Welp, an exciting future awaits for you.]

It’s not good for a senpai to defile a pure kouhai.

“Haah, really. If I get flustered over something like this, it’ll be a big problem…”

Taking a deep breath, I decided to do today’s homework until Mitoma-san arrives.

Two hours later…..

After the 5th period lecture ended around 5:30 PM, the intercom rang announcing that the person I was eagerly waiting for had arrived.

I immediately rushed to the entrance and let her in, and she promptly returned the jersey she borrowed from me.

“Ah, thank you.”

“No, I’m the one who should be thanking you. And, I’m sorry for returning it late.”

“No, it’s fine. You can take it home with you.”

“Well then, in that case… no, it’s fine.”

“Ah, okay.”

I reflected on thinking unnecessary thoughts as I saw her return the jersey with a downcast expression, it was as if something precious was being taken away by her.

“Since you’re here, would you like to have some tea or something else before you go?”

“Yes… you’re too kind aren’t you, Senpai?”

“Haha, thanks for the flattery but I’m not really that kind.”

“That’s not true.”

And so I made Mitoma-san sit on the sofa and made green tea in the kitchen. After a few minutes, I handed her the tea and was thinking about turning on the TV leisurely. Holding the cup, I looked around the room and said:

“My house is… a bit dirty, isn’t it?”

“…..”

“Can I clean it up?”

“Ah, yes. Please.”

“Then, shall we do it after we take a break?”

She nodded in reply and so we decided to clean the house during our break time.

After getting used to working part-time and living alone as a college student, there was nothing left for me to teach my kouhai anymore. Was it finally the time when I’ll get taught by my kouhai instead? I didn’t really want to say it out loud, but I guess these past days, I was the one who was being taken care of.

“Alright, shall we start?”

“Yeah.”

And so, I began to clean my room with my kouhai which surprisingly went on for around 10 hours and surprisingly none of us noticed the time passing by.

While my kouhai was cleaning, my phone vibrated and I received a message. Who could it be at a time like this? Is it perhaps someone from my class… Could it be the club president? Murakami? (Murakami is the nickname of the club president, who was also my friend from high school and a rival.)

Anyway, back to the message. I opened my phone’s Line app and saw that the message was from my younger sister, Miyuki.

「Hey, I want to go to the university’s open campus this weekend. Can I stay at your place?」

This week, huh? So it’s Golden Week. I had noticed that all the research labs were actively experimenting lately, but I didn’t think it had anything to do with this. My university was different from others as we had an open campus tour for about a month from May, during Golden Week, so during this time, all research labs were working hard to present their results.

But still, I didn’t think my little sister was interested in this university.

「Sure?」

I replied back to my sister, who immediately sent a follow-up message. I couldn’t help but feel nostalgic about her persistence and annoyingness.

「Ugh, I don’t want my big brother to tell me that. So, is it okay?」

I couldn’t help but tease my little sister as I felt nostalgic. My mischievous little sister had grown up enough to think about college.

It looks like my sister has really grown up.

Miyuki is currently a sophomore in high school and is three years younger than me. When we were kids, she always followed me around when he played outside.

Thanks to that, she still participates in sports and has a high physical education rating.

As we grew older and stopped playing outside together, Miyuki started hanging out with her female friends, but her fashion sense didn’t change much.

She wears tracksuits at home and never wears skirts outside. She only wears jeans and pants, and doesn’t even own any fancy underwear other than sports bras.

I don’t mean to compliment her, but she’s attractive enough that I am worried about her future boyfriend’s disappointment.

Anyway, I’ve been looking forward to seeing Miyuki again after so long.

“Senpai, is something wrong?”

“Oh, no, it’s nothing. Just some personal stuff.”

“A secret?”

“No, it’s not like that. Oh… I guess I should tell you.”

Mitoma-san doesn’t need to know about this, but it’s not bad to mention it either. Besides, this way, my sister will probably stay at my house, and Mitoma-sam, who often comes to my house, will probably meet her.

“My sister is coming over to my house next time.”

“What, your sister?”

“Yeah, my younger sister. She’s a sophomore in high school now, I think.”

“You have a sister, senpai?”

“Well, yeah. Is that unusual?”

Mitoma-san stops cleaning and looks surprised, so I asked her, ‘Is something wrong?’ to which she replied with a chuckle, ‘I just didn’t expect you to have a sister who is so…’

At this point, I was completely silent and couldn’t say a word either. 

“Yeah, I know…”

“But, senpai’s little sister huh… She’s more than welcome! I’d love to meet her!”

“Really? That’s great.”

“I’ll treat her with some homemade cooking, so let’s all stay together!”

“Yeah, she’ll probably like that. Thank you.”

“Sure thing! I got it!”

Mitoma-san smiled happily.

Wow, if she’s looking forward to this so much, I’m excited too. If both me and Mitoma-san go to graduate school, Miyuki will be our junior, so if we can become friends now, it will lead to the development of our future relationship.

That’s right, let’s stay together… Wait, what?

Something’s weird with her words, right? 

Stay together…? 

What, seriously?!

After the cleaning was done, and Mitoma-san left, I realized that I may have just made the biggest promise of the century. 

[PoV] Suzune Mitoma :

Come to think of it, I couldn’t find any erotic books in my senpai’s room.

Everyone says that men are looking at them on the internet these days, so maybe they’re buying them as e-books.

It’s unfair senpai… 

…But, somehow, when I say that, it feels like I’m being teased and it excites me. Hehe~, I wonder if I’m really a pervert.

“Well, it was good that I cleaned the house to get recognized by senpai’s little sister.”

Since my senpai is coming to evaluate me I have to work harder. 

Oh, and my senpai’s little sister! I’m so excited to meet her!

I wonder what she’s like… I’m sure she’s pretty, cute and looks like my senior.

Hehe~, I might as well make them a brother and sister meal… Just kidding.

But, I’m really looking forward to it.

Meeting my future sister-in-law is… exciting.

I have to make sure to serve her delicious food!