That evening.
"Onii-chan, I'm done!" Yotsuba announced.
"You spelled this wrong, Yotsuba," Yoshida pointed out.
"Fweh!?"
"Onii-chan... I'm done," Miku said quietly.
"Miku, you spelled it wrong too."
"Muuu."
"All done, Hiro-nii." Nino presented her work with a smug look.
"Oh! Nino, you're as good at English as always. No issues here."
"Fufun. Well then, I'll go first." Nino leaned in and captured Yoshida's lips with hers, her tongue sliding into his mouth with a wet, lingering kiss. She licked and sucked, her breath hot against his skin, before pulling away with a satisfied hum. "Mmm, delicious."
"Alright! Finished, Onii-chan!" Itsuki declared.
"Hmm... yeah, Itsuki, no problems here either."
"Yay! Then me too." Itsuki took her turn, pressing her mouth to his. The kiss grew messy as her tongue intertwined with his, soft moans escaping her throat while she tasted him. She finally broke away with a happy giggle.
All the sisters except Ichika had gathered at Yoshida's place to study for the regular exams next week. For some reason, a reward system had been established: solve a problem and earn a kiss from him. Naturally, that had everyone brimming with motivation.
Today's subject was English, and while Miku and Yotsuba were struggling hard against their weak spot, Nino and Itsuki had already finished and were thoroughly enjoying their kisses.
"Uuuugh... finally done! How about now?" Yotsuba asked, exhausted.
"Hmm? Yeah, Yotsuba, no problems here."
"Yay, I did it! Then." Yotsuba didn't wait. She pressed her lips against his, her kiss eager and long, her tongue immediately seeking his. She licked and sucked, moaning into his mouth as the kiss deepened. Her tongue danced around his, the wet sounds filling the room as she dragged it out, clearly wanting more.
"That's too long!" Nino grabbed Yoshida and pulled him away from Yotsuba, breaking the kiss.
"Eeeeh! Just a little more." Yotsuba whined.
"I want more too, you know! Hey, Onii-chan." Itsuki couldn't hold back anymore and sent him a pleading look.
"No way. You just had yours, Itsuki," Yoshida said, pressing his palm against her forehead to stop her from leaning in for another kiss.
"Buuu! Buuu!" Itsuki pouted and complained loudly.
"Alright! This time for sure! Here, Onii-chan." Miku finally finished her work and held it out.
"Yeah. Miku, no problems. Good job."
"Finally done." Exhausted from battling her least favorite subject, Miku leaned in and kissed him. Her tongue licked and probed his mouth slowly, a tired but sensual kiss.
When she pulled back, a satisfied smile spread across her face. Yoshida felt like, if he wasn't mistaken, she was silently inviting him for more.
"Hey, Hiro-nii... Just kissing isn't enough anymore, is it?" Nino's voice was husky, her eyes half-lidded with desire.
"Yeah... I want you, Onii-chan." Itsuki added, her gaze hungry.
"Mm... me too." Miku breathed.
All three of them—Nino, Itsuki, and Miku—were looking at him with glazed, lust-filled eyes.
"Stop it. Yotsuba is here too, so that's enough for now."
"Huh?" Itsuki reacted to his words and glanced at Yotsuba. Nino and Miku followed suit.
"Yotsuba. Have you done anything else with Hiro-nii besides kissing?" Nino asked bluntly.
"Eh? Uh... um." Yotsuba nodded, not quite understanding the question.
"Don't tell me, you've never had Onii-chan touch your tits or your pussy?" Miku's words were shockingly direct.
"Eeeeeh!? Of course not!" Yotsuba's face turned bright red at the implication.
Nino, Miku, and Itsuki exchanged a look and nodded to each other.
"Alright, no helping it. We'll head home for today," Nino decided.
"Yeah... Yotsuba, you should stay the night at Onii-chan's place," Miku suggested.
"What... just me?" Yotsuba blinked in surprise.
"Mm-hmm. You should let Onii-chan dote on you. We'll let Mom know," Itsuki added sweetly.
"Hey... you're just deciding things on your own." Yoshida tried to interject, but the three sisters already grabbed their bags and stood up, getting ready to leave.
"Seriously... You love all five of us, right? So it's totally unfair if only Yotsuba hasn't experienced anything," Nino said.
"Yeah. She needs to share that pleasure too," Itsuki chimed in.
"See you later, Onii-chan. Next time, make sure you dote on us properly." The three of them left, completely ignoring his protests.
Now, only Yoshida and Yotsuba remained in the room.
"So... what do you want to do, Yotsuba? Go home?"
"No. Um... if Onii-chan is okay with it." Blushing hard, she cast her eyes down and timidly asked to stay the night.
"Ah... Nn... Ah... It feels so good."
After eating dinner and taking a bath, both of them were now naked on the bed. Yotsuba trembled under Yoshida's caresses, her sweet moans filling the air.
"Muu... It's so mean that you never did anything with me before... Ah."
"Sorry, sorry. You know... because of your history with Fuutarou, I just couldn't bring myself to cross that line." He kissed her nape while kneading her breasts, his lips and tongue tracing her neck.
Yotsuba melted under the attention, but a tinge of dissatisfaction remained from having been left out until now.
"Nn... Thank you, Onii-chan... Ah... Mmm... So you were thinking about me after all."
"Of course I was. I'd never force you. I thought maybe you still believed you might meet Fuutarou again someday, so I held back, for that possibility." He captured her lips again, his tongue sliding against hers.
"Aaaaah!" A light suck on her nipple sent a jolt through Yotsuba's body, and she came with a soft cry.
"Haa... Of course... I did consider that possibility... Ah... Mmm... But... I love you too, Onii-chan... Ah... You're always watching over me... Ah... It feels so good... I love you so much, Onii-chan... Ah, aaaaaaahn!"
Even as he continued sucking and rolling her nipples between his fingers, Yotsuba climaxed again, her body arching off the bed.
"Thank you, Yotsuba... Here." He gave her a light kiss as she lay there dazed. "What do you want to do? Should we go all the way?"
"Haa... haa... Yeah... Please... put it in." Eyes half-closed, she smiled softly.
"Alright. But first, let me get this place a little wetter." Yoshida traced his fingers along her slick vaginal opening.
"Ah... Mmm... Right there... It feels so good."
"Fufufu... Seeing the usually energetic Yotsuba moan like that is a real turn-on." He sucked on her nipple while slipping a finger inside her tight pussy.
"Ah... Aaaaah... Onii-chan's finger... is inside me... Nn... It feels incredible."
Yotsuba's insides were already drenched with arousal, but he wanted to make sure she was ready. He explored her inner walls, pressing and stroking…
...
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