Yuki swung open the door to her and Kurumi's shared bedroom, a playful smirk on her face. "Well, well, well, if it isn't my little sister," she said, sarcasm dripping from her voice. "You know, Kurumi, you really don't stand out in any way. You're just so...boring."
Kurumi, who was sitting on the bed, felt a pang of defensiveness. "I am not boring," she shot back. "In fact, I'd say I'm more mature now."
Yuki's smirk grew wider. "Oh really?" she said. "Well, I guess we'll just have to see about that."
Before Kurumi could react, Yuki was on her, ruthlessly pulling off her T-shirt. Kurumi's bare chest was exposed, and she tried to resist, but it was no use. The sweetness of her climax was already overwhelming her.
Yuki took advantage of the situation, beginning to massage Kurumi's chest. Kurumi's nipples stiffened under her touch, and she tried to protest, calling Yuki "Basara" in a playful insult.
But Yuki was amused by her sister's attempt to resist. She continued to massage Kurumi's chest, bringing her closer and closer to the brink of another climax.
Kurumi, unable to take it any longer, gave in and allowed Yuki to have her way with her. Yuki, victorious in the maturity test, playfully teased Kurumi about her defeat.
Kurumi, still in a state of bliss, couldn't help but admit that Yuki was indeed more mature. Yuki, satisfied with the outcome, helped Kurumi put her clothes back on and the two sisters shared a playful, intimate moment.
As they lay in bed together, Yuki whispered in Kurumi's ear, "Don't worry, Kurumi... very soon we will force you to give in." With those words, she stretched out her hand to Kurumi's chest and began to massage it again.
Kurumi, already sensitive from their previous encounter, couldn't help but moan in pleasure. Yuki, pleased with Kurumi's reaction, continued to massage her chest, bringing her closer and closer to the edge.
Just as Kurumi was about to climax again, Yuki stopped and smiled at her sister. "I guess that's enough for today," she said. "But don't think this means you've won. The maturity test is far from over."
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