[Umai] Warm Cozy Rumpy Pumpy (Little Girl Strike Vol. 26) {Mistvern}

Bratty tomboy Amane turns a lazy afternoon at the kotatsu into an all-out sibling showdown, straddling her older brother in bike shorts and daring him to keep up with her relentless pace. What starts as petty bickering—she calls him a scumbag horn-dog, he fires back about his bratty little sister—spirals into a sweat-soaked first time where neither is willing to admit defeat, her smug grin cracking into open-mouthed bliss as her body betrays just how badly she wanted this. By the end, breathless and dripping, Amane is already gunning for round two, grinning like she's won a war her brother never agreed to stop fighting.