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A younger sister returns home feeling depressed after a date with her boyfriend. The younger sister, who is depressed after failing to have sex, shows her bravery by expanding her pussy. I noticed that my younger sister masturbated like that every day... At the limit of my patience, I said, ``It's because it's going to expand and make it easier for my boyfriend's big dick to enter...'' and have practice sex with my sister every day! Gradually, even though the younger sister was just practicing, she started to realize the pleasure of brother-sister sex... Before they knew it, brother and sister started having sex that was even harder than practicing.