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"It's okay, it's okay. If something bad happens, you can just use your big sister as your onahole." Moka, a gal who returned to her hometown from university, had a worry: her younger brother Kazuma, whom she had always adored, had become a shut-in. Moka, who has always spoiled Kazuma, decides to accept his anxieties and desires, becoming his "exclusive woman" who rushes to his side whenever called. Embracing him daily and affirming everything like a holy mother, Moka gently accepts even his deepest lusts. Eventually, their abnormal affection gradually transforms into a twisted relationship...
