It's been a while :)
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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…
"Fuaah... Right there... That spot feels so good."
When her reactions sharpened at a particular spot, he focused his attention there, applying pressure with his finger while sucking hard on her nipple.
"Ah... No... No, no... Something's coming... I'm gonna cum!"
He kept licking. "It's okay. Just let go."
"Mm... Ah... Ah... Ah... Aaah... I can't... It's coming... I'm cumming!"
Unconsciously, Yotsuba started rocking her hips. Her body convulsed, hips lifting off the bed as the most intense orgasm of the night ripped through her.
Yoshida positioned the swollen head of his fully erect cock against her dripping pussy. After what happened with Ichika yesterday, he had no condoms left, so he'd have to go raw. He'd need to be careful.
"Haa... haa... haa... Nn... You're really going to put it in."
"Yeah. It might hurt, but can you endure it?"
"Uh... uh-huh... Gulp... Um... Do all guys' cocks get this big?" Yotsuba stared wide-eyed at his shaft rubbing lewdly against her wet slit, swallowing hard.
"There are individual differences. Just like girls have different chest sizes, right?" He squeezed her large breasts to emphasize the point.
"Ah... I... I guess so... I wonder what Fuutarou-kun's is like."
"Fufu. If you ever meet him again, maybe you could ask him to show you?"
"Pfft...! That might be fun...! Ah... Nn... Okay... Come, Onii-chan... Give it to me."
Maybe the sensation of his cock sliding along her slit had rekindled her arousal—her voice turned sweet again, and with a resolved smile, she reached both hands out to him. In that gesture, he saw the same boldness Ichika had shown him.
Accepting her invitation, he lowered himself onto her, claiming her mouth in a deep kiss as he pushed his cock forward.
"Nn... This kiss is wet and messy... Mmm... Aaah! Aaaaaah!"
Just like Ichika, Yotsuba's pussy was incredibly tight, her inner walls clamping down on him. She was clearly trying her best to endure, so he focused on distracting her with kisses and caresses to her breasts.
"Ah... The licks and kisses... Onii-chan... It's okay... Keep going... Push deeper... Ah... Mmm."
Taking her encouragement and the return of her sweet moans as his cue, he drove his cock further inside until he felt the resistance of her hymen give way.
"Ah... Aaaaaahnn! Haa... haa... haa... Amazing... So this is what a cock feels like... inside me."
Though there must have been pain, Yotsuba seemed to be drowning more in pleasure, a sensual smile on her lips as she experienced his length fully.
"How is it? Are you okay?"
"Yeah... Haaa... It's incredible... We're connected now... one."
"Yeah... We're joined together right now, Yotsuba and me." He kissed her neck and collarbone as he spoke.
"Nn... Ah... Onii-chan's kisses... feel so good."
Then Yotsuba began to roll her hips, chasing the pleasure on her own.
"Yotsuba!?"
"Hey... aren't you going to move...?" Her eyes glistened, her hips still rocking as she pleaded.
"Alright. But you have to tell me if it hurts."
"Mm... I'll tell... I'll tell you... so move."
She wrapped her arms around his back and locked her legs around his ass, effectively trapping him inside her. Yoshida mentally cursed—if he stayed like this, he'd end up blowing his load deep in her pussy.
"Yotsuba. I can't move easily like this. Can you unlock your legs for me?"
"Eeeh... Muu... If Onii-chan says so." She obediently released him, and in thanks he began to thrust.
"Ah... Mmm... Good... It's so good... Ah... Mmm... More... More. Deeper!!!"
Matching his rhythm, Yotsuba rocked her own hips. Taking the cue, Yoshida grabbed her waist, lifted her slightly, and increased the stroke of his thrusts.
"Ah... So good... Onii-chan... Feels so good... Ah... Mmm... No... It's too good."
Her tight pussy clenched around his dick as if refusing to let go, the walls fluttering and rippling along his shaft.
'This is bad, dangerously so.' Forgetting it was her first time, he gave in to his own pleasure and fucked her harder.
"Amazing... It's amazing, Onii-chan... Ah... Ah... Ah... Ah... This is incredible."
"Yeah... Your pussy feels so fucking good too!"
"Really? Then feel even better... feel more." Her inner muscles tightened further, amplifying every sensation tenfold.
'This girl, a natural at this, is going to drive me over the edge.'
"Ah... Ah... It got even harder... So good... Onii-chan... It's amazing."
"Sorry, Yotsuba... I'm already...!"
"I don't really get it, but it's okay... Ah... Ah... Mmm... I'm cumming too... I'm cumming!"
"Go ahead... Cum for me... Yotsuba!"
Desperate to push her over first, he held back his own ejaculation and kept pistoning his hips.
"No... No, no... No... I'm cummmmmmming!"
"Guh!"
The instant Yotsuba climaxed, her pussy clamped down so viciously he almost came inside her. With a mighty effort, he yanked his cock out, scrambled up, and stroked himself frantically right over her face until thick ropes of cum splattered across her cheeks and lips.
Splurt... Splurt splurt...
"Is this... Onii-chan's... semen?" she murmured, and then licked the cum from around her mouth with a soft lap of her tongue.
"Ehehe... It's delicious."
"Yotsuba, lick this side too." He presented his still-throbbing cock to her lips, and without hesitation she took it into her mouth, cleaning every last drop.
The slurping sounds echoed, "Haaa... This feels so good."
"Yeah. It's amazing." He wiped the semen from her face with a tissue and gently stroked her head, smiling down at her.
"Ehehehe... Ah... Onii-chan's is still so big... Hey... Can we do it more?"
Noticing his erection hadn't flagged, Yotsuba wrapped her fingers around his shaft and begged.
"Are you sure you're okay, Yotsuba?"
"Mm-hmm! I can still go plenty."
As expected of the sister with the most stamina—she looked utterly unfazed. And so they continued, surrendering to their shared pleasure over and over again.
Dawn was approaching.
"Ah... Ah... Mmm... So good... More... More... Fuck me deeper."
How many hours had passed? With only brief rests, Yoshida and Yotsuba had been entwined the entire time. Now she was on all fours, and he was pounding into her from behind.
"I'm fine, but Yotsuba... school's today, you know. Aren't you going to rest?"
"Mmm... Ah... It's so good... Because it feels so amazing... Aaaahhn."
Hopeless. Yoshida grabbed both her arms, pulling her up until she was kneeling with her back arched in a deep curve, and drove his cock into her deepest parts with rapid, relentless thrusts.
"Oh... Oh... Oh."
She'd cum so many times she was on the verge of blacking out, her mouth opening and closing soundlessly, eyes rolled back.
"I'm guuuuuuuuh!"
With one final slam of his hips, Yotsuba collapsed onto the bed. He pulled out and jerked his cock over her upturned ass, shooting another load across her skin.
Splurt... Splurt splurt...
"Haa... haa... haa... Seriously, there's a limit to how much stamina one person should have."
Beside the unconscious Yotsuba, now dead to the world, Yoshida flopped onto his stomach. The room reeked of cum, sweat, and arousal. He wanted to open a window, but sleep dragged him under before he could move, and he, too, lost consciousness.
The next morning.
"Come on, Yotsuba! You're going to be late!"
"Uuun... I'm sleepy... Onii-chan," she mumbled.
"I told you this would happen."
"Muuu... But... Then... a good morning kiss."
'Honestly, these sisters are all so shameless.' Yotsuba pulled him in for a deep, tongue-filled kiss before breaking away with a happy sigh.
"Ehehe... Good morning."
"Yeah, good morning. Now get dressed. Breakfast is ready."
"Onii-chan made it himself!? Yay!"
Watching Yotsuba suddenly burst with energy and start getting dressed, Yoshida could only let out a weary sigh.
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Advanced 10 chapters with pictures at: ko-fi.com/pinto_sh