Returning from their jog, Yoshida and Yotsuba decided to take a shower since they were both drenched in sweat.
"Well, you go first, Yotsuba. I don't mind waiting."
"Huh? It's fine, we can shower together. Saves time. Let's go!"
"Wha—hey!"
Ignoring his protests, Yotsuba grabbed his hand and pulled him into the changing room.
"Ahh, after all that running today, I'm soaking with sweat... Hmm? Onii-chan, aren't you going to get undressed?"
Standing right in front of him, already stripped down to nothing, Yotsuba looked at him quizzically.
"Well, if you're okay with it, then I guess I am too..."
"Huh?"
Seeming unconcerned, Yotsuba tilted her head slightly but headed into the bathroom anyway. Yoshida followed her inside.
Once in the bath, he immediately started washing Yotsuba's back.
"Hehe... Your back has gotten bigger, Yotsuba."
"Ehehe! I'm a high schooler now, after all! You haven't changed much, Onii-chan."
"Well, I was already a university student back then. Guess you don't grow much once you're in uni."
"But... isn't your penis, like, a little bigger now?"
Yotsuba turned around and said this while looking at him.
Well, of course, he was half-hard after being shown such an erotic body!
"Ahaha... You think so? Here, wash the rest yourself."
"Okaaay!"
He was relieved that his little distraction seemed to work.
After washing up, they got out and changed clothes right away.
Yotsuba seemed to prefer sports bras.
But...
"I feel like I've seen those panties before. How long have you had them?"
"Huh?! Umm... since elementary school..."
"Whoa, seriously? They look way too tight. Why not wear a different pair?"
"Hmm... they still fit, though... By the way, Onii-chan, what kind do you like?"
"Eh?! Well, I'm not really an expert on women's underwear..."
He tried suggesting she change the panties she'd had since elementary school, but ended up getting flustered when she asked about his preferences instead.
"Hmm... maybe I should wear the kind Ichika and Nino wear..."
'Ichika, huh... Isn't that a bit much? Wait, Nino wears the same kind, too? Damn!' He started imagining it.
"Hmm? Onii-chan, does your stomach hurt?"
"No, ahaha..."
He had bent over slightly, turning his back to her, and Yotsuba asked. He couldn't exactly say he had a slight boner, so he kept changing clothes to hide it, but Yotsuba was staring intently at her ribbon.
"What's up?"
"Yeah... This ribbon was proof that 'I am here'... But if you can find me, Onii-chan, maybe I don't need it anymore..."
"But it's your trademark, right? Won't your friends at school get confused?"
"It's fine! Mom, my sisters, and most of all, you'll find me, Onii-chan!"
"...!"
Seeing Yotsuba smile brightly as she said that, his heart unexpectedly skipped a beat.
'Man... this is a problem...'
"Well then, maybe you should take a little more care of your hair? Let me fix it with a brush."
"Really?! Hehe... thanks!"
As he gently brushed her hair, Yotsuba beamed with happiness.
"Hey, Onii-chan?"
"Hmm?"
"Will you kiss me again?"
"Here?"
"Yeah! You said anytime, right?"
Yotsuba turned around, a mischievous look on her face.
"Honestly... alright, close your eyes..."
"Okay! Mn... mwah... haah... mwah... mwah... Hehe, love you, Onii-chan."
After the kiss, Yotsuba hugged him, and he gently hugged her back.
"Oh my, you two just got back?"
When they entered the living room together, they were greeted by Rena, who was ready to go out. The other four sisters were eating breakfast at the table.
"Nope. We got back a little while ago, but we were showering together until just now."
Yotsuba answered Rena's question cheerfully. However, saying that now was bad...
"Wha—?! Yotsuba, is that true?!"
"Yeah! It felt good! Right, Onii-chan?"
She answered Nino's question while clinging to his arm.
"Felt..."
"Good..."
"Onii-chan?"
"Oh my..."
"..."
At Yotsuba's statement, Ichika, Nino, and Itsuki all looked at him. Rena and Miku were acting normal, with Miku even continuing to eat her breakfast.
"Hmm? What's wrong, you three?"
Yotsuba noticed Ichika, Nino, and Itsuki acting strangely and looked puzzled.
"Um... Yotsuba? What exactly did you do for Onii-chan?"
Ichika asked on behalf of the others.
"Huh? He washed my body? Is there something else we should have done?"
Yotsuba didn't understand the intent behind Ichika's question and answered matter-of-factly. Hearing her answer, Ichika, Nino, and Itsuki looked relieved.
"R-right! Of course, there's nothing else besides having your body washed!"
"R-right! Ahaha."
"Hmm?"
Nino and Itsuki laughed awkwardly at Yotsuba's answer, which only made Yotsuba look even more puzzled.
"Fufu... Come on, Yotsuba, eat your breakfast quickly. You'll be late."
"Okaay!"
"Oh? Yotsuba, what happened to your ribbon?"
"Yeah. I thought I wouldn't need it starting today. Itadakimasu!"
When Rena asked Yotsuba about not wearing her ribbon, Yotsuba smiled and answered before starting to eat.
"Is that so..."
Hearing that, Rena smiled gently and looked at Yoshida.
"Well, I'm heading out now. Make sure you all leave so you're not late, alright?"
'Yes!'
The five of them replied energetically, so Rena smiled warmly and headed for the entrance.
"I'll see you out."
"Oh my, thank you."
When Yoshida followed her to the entrance to see her off, Rena, now in her high heels, hugged him. He responded by hugging her back.
"Thank you for taking care of Yotsuba."
"Huh? I didn't do anything, though?"
"Fufu... That's so like you, Yoshida-kun... Nn... mwah..."
He didn't remember doing anything, but if it made Rena happy, then it was fine.
Rena's kiss was brief, and she placed her hands on his shoulders.
"Ahhn... Won't you do more?"
"I'd love to get more intense, but if we go further, your nicely done makeup might get ruined. Mwah..."
He gave her another light kiss.
"Fufu... Well then, please fuck me real hard tonight, okay?"
Rena whispered this in his ear before heading off to work with a smile.
Rena...
'Saying things like that gets my hopes up and gives me a boner!'
Thinking about this, Yoshida was staring at the entrance where Rena had left when he felt a hand reach for his crotch from behind…
...
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