Forbidden relationship - incest. The body of the innocent little sister is gradually becoming more and more adult... The brother can no longer endure the unbalanced sex appeal of the adolescent Kokoro and body, and goes to his sister's bedroom! The moment he sees her body, which is still immature but has begun to take on a feminine roundness, floating in the darkness, the brother's thick sperm is poured into his sister's undeveloped uterus...! The 6th installment of the popular series!