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Imouto datte Tsukatte Ii no yo?
妹だって使っていいのよ？
A college student returns to his family home and finds that his younger sister has grown into a young woman. Living under the same roof again, he struggles with his newfound feelings for her, which blur the line between sibling affection and romantic desire. Their daily interactions become charged with tension as he tries to suppress his inappropriate thoughts.
One day, an unexpected accident forces them into an intimate situation, breaking the barrier of their sibling relationship. Unable to resist the temptation, they give in to their forbidden desires, exploring a secret bond that society would never accept. The story follows the consequences of their actions as they navigate the dangerous territory of their hidden affair.