"My dream is to marry you one day, big brother..." says the adorable sister Eri, blushing cutely with a sweet smile. Driven by her desire to deepen their bond, she passionately and greedily seeks to take her brother's semen into her womb. Tempted by her words, her big brother can no longer suppress his lust and quickly becomes aroused, his erection evident. Seeing him like this, Eri embraces him with a mix of joy and excitement, then forcefully pins him down. As their passion intertwines, the warmth and pleasure of the moment lead them into a relationship that can never return to what it once was.