After being told by her younger sister Eimi Fukada to take her lover home to play, she was very happy and excited about it, because Eimi is usually very shy and doesn't like to interact with strangers, she just goes to school and then comes home to read books every day. I thought my sister was gentle and knowledgeable, but unexpectedly with sexual curiosities in puberty, when she learned that her sister forced her lover to wait until she got married to have sex, the lewd sister took the initiative to volunteer for her future brother-in-law to have sex with her first to be less surprised :)))