Hirokazu Yoshida was an ordinary young man who had just begun living alone after entering university.
There was a woman he admired.
Her name was Rena Nakano.
She had happened to come out of the neighboring apartment during his move, and she was an incredibly beautiful woman.
Yoshida had fallen in love with her at first sight.
She had long black hair that reached her shoulders, piercings in both ears, and while she usually had an ephemeral look about her, there were times when her face would overflow with smiles. Perhaps the times he saw that expression were his favorite.
Those were the times when she was interacting with her daughters.
Her daughters, remarkably, were quintuplets, and she was raising them all by herself.
There had been a difficult period for a while, but she had managed to pull through and now worked as a high school teacher.
"I'm home. Oh my, Hirokazu-san, you were looking after my girls again?"
"Ah, welcome home, Rena-san."
"Welcome home, Mom!"
The quintuplets were in the sixth grade. However, since they were completely incapable of handling housework, he occasionally found time to cook meals and clean, helping Rena out.
And whenever Rena returned from work, the quintuplets would always run up and hug her, just like today.
"I'm so sorry. You made dinner and fed them again today, didn't you?"
"Not at all, it's nothing much. I'm living alone and have free time anyway."
"Hehe... Thank you."
Every time he saw the smiles she occasionally showed him, his heart would race.
"Have you all been properly thanking him?"
"Of course! I love Hirokazu onii-chan!"
"He taught me more cooking tips today."
"Hirokazu onii-chan is amazing, he knows everything!"
"He helped me study today and praised me."
"Hirokazu onii-chan's cooking is almost as delicious as Mom's!"
Yoshida was happy that they were all praising him.
"Thank you. I love you all too."
When he told them with a bright smile, five beaming smiles were returned to him.
"Well, now that Rena-san is home, I should probably be heading back."
"Ehhh?! You should stay over sometime!"
As he stood up to return to his own apartment, Ichika, the eldest, took his hand to stop him.
"That's right. I want to sleep next to onii-chan."
Then, Miku, the third daughter, started tugging on his pants, trying to stop him just like Ichika.
"Um..."
Wondering what to do, he looked toward Rena, who smiled warmly and replied.
"The girls are insisting, so Hirokazu, if it's alright with you, please stay over."
"Y-yes... Well then, if you insist..."
He couldn't refuse when she looked at him like that. He agreed to stay instead of returning to his room
"Yay! Then, I'm sleeping next to Hirokazu onii-chan tonight!"
The one who raised her voice in joy at his words was Nino, the second daughter. Declaring that she would sleep next to him, she wrapped her arms around his waist and hugged him.
"Uuu... I guess it can't be helped since it was my turn last time... Mom, can I sleep next to you?"
"Of course. That's fine."
The one looking disappointed was Itsuki, the youngest and fifth daughter. Realizing she couldn't sleep next to him, she asked Rena if it was okay to sleep next to her instead.
"Honestly. All of you, you mustn't trouble Hirokazu onii-chan. See, you stopped in the middle of studying earlier, didn't you? You need to study properly, follow my example."
Unlike the other four who were making a fuss, Yotsuba, the fourth daughter, had an exasperated expression. As she said, Yotsuba was the one who studied the hardest. She had mentioned having some kind of goal.
Incidentally, these quintuplets... They all had the same hairstyle and wore the same clothes, so at first, Yoshida had struggled to tell them apart.
He'd made mistakes, gotten scolded, and repeated the process, but now he could manage to distinguish them. To some extent, he was going by feel.
According to Rena, 'If you have love, you can tell them apart.'
'Love, huh...'
He didn't know if he had love for the quintuplets, but each of them had distinct personalities.
Ichika was a mischievous and opportunistic child. Nino was caring toward her sisters but had a strong-willed side. Miku was a bit shy and timid. Yotsuba had a mindset of being a role model for everyone and was the most athletic of the sisters. As for Itsuki, she was a bit of a spoiled child and often ate a lot.
He distinguished them based on that, so whether this could be called 'love' was debatable.
By the way, Yotsuba wore a large, rabbit-ear-like ribbon, and Itsuki used a star-shaped hair clip, so he could also tell them apart by those.
"That's it! This time, I'm taking a bath with you~!!"
Right after it was decided he would stay, Itsuki made that suggestion.
"No, I really don't think that's a good idea."
"Why?"
When he refused, Itsuki asked, her eyes welling up with tears.
'Ugh...' Yoshida was weak to that face.
Feeling troubled, he looked at Rena for help.
"Once in a while should be fine, shouldn't it? Itsuki is insisting this much."
"Grr... If Rena-san says so..."
"Yay! Let's go, onii-chan!!"
When he reluctantly agreed, Itsuki took his hand and tried to lead him toward the bathroom.
But—
"Muu... Itsuki, that's not fair."
"That's right! I want to join too!"
"As the big sister, I should have priority..."
"Ichika, you always try to take over like that!"
The other four saw this and started making a commotion.
"Now, now. Given the size of the bath, let's limit it to one more person. Nino, Miku, you're sleeping next to Hirokazu-san tonight, so let your other sisters have this."
""Okay...""
At their mother's words, Nino and Miku reluctantly nodded.
"And? What about you, Yotsuba?"
"W-well... I might want to join Hirokazu onii-chan too..."
"Then, let's settle it with rock-paper-scissors."
"I won't lose, Yotsuba! Rock-paper-sciss—"
And so, as a result of the game, it was decided he would bathe with Itsuki and Yotsuba.
However, even if they were sixth graders, they were still in elementary school. 'Aren't they embarrassed?'
He found himself wondering this as he watched Yotsuba and Itsuki take off their clothes without hesitation in the changing area.
"What's wrong, onii-chan? Aren't you going to take your clothes off?"
Itsuki, already completely naked, asked him.
Her breasts, while small, were budding, giving her a girlish figure. It seemed she didn't have any pubic hair yet.
"No, it's just... Aren't you two embarrassed to be seen naked by me?"
"I wouldn't want the boys at school to see, but it's fine if it's Hirokazu onii-chan."
Yotsuba said this while taking off her ribbon.
'Well, if they said so, there is no point in me being embarrassed.'
And so, he took off his top and underwear, folded them, and entered the bathroom.
"Onii-chan really is big, huh!!"
"Is that thing between your legs your penis?"
"Guh... Don't use that word. Well, yes, it is."
Feeling incredibly embarrassed, he decided to sit on the stool in the bathroom and wash his body.
"We'll wash your back for you!"
"That's a great idea, Yotsuba!"
And so, he let the two of them wash his back.
"But still, it's so big, your penis. I saw one of the boys in class when his pants were pulled down, but yours is way bigger."
"I told you not to use that word, Yotsuba."
While washing his back, she shared her impressions upon seeing his penis.
"Why not? The boys in class talk about it all the time."
"It's fine for boys, but it's not something girls should say."
He answered Itsuki's question in a harmless way.
"Hmm… Now that you mention it, we learned in health class the other day. If you put that into a girl's… opening, she can have a baby, right?"
"Wow, Yotsuba. You've been studying hard."
When he praised Yotsuba, she looked proud of herself.
"But… can something that big really fit in here…?"
"You guys are still growing, so someday you'll be able to accept it."
"Really!? Then, when I get bigger, I'll have you put it in me, onii-chan~!!!"
"Huh...?"
'Why did it turn out like this?'
The Itsuki in question was cheerfully washing his back.
Well, once Itsuki finds someone she likes, she'll probably forget these words.
Thinking that, he let her wash him, and then he washed both of their backs in return.
Even after getting into the bathtub, the two of them happily talked about their day, and he thought they had an enjoyable time.
Then, as it was time to sleep, they each got into the futons laid out side by side.
It was there that another reason he didn't want to stay here emerged.
"I'll turn off the lights now."
""Okay~!""
Rena pulled the light cord to turn off the lights, but she was wearing a negligee.
That sight was too stimulating for Yoshida, a college student, and his dick instantly erected.
Just thinking about that hot MILF sleeping nearby, the tension and his erect cock made it hard for him to fall asleep.
At times like these, he would always use the restroom and masturbate to suppress it.
So, tonight as well, waiting for everyone to fall asleep, he dashed to the toilet.
Rushing into the toilet, he handled his penis while imagining Rena in her negligee.
"I wonder who's in the toilet…"
Just as the urge to ejaculate was peaking and he was about to cum, the door was knocked…