She's so serious that she turns red when I say dirty jokes. She's beautiful, but she doesn't seem to have a boyfriend at all, so I teased her and made fun of her, saying, "You're a virgin," and it turns out to be the real thing! When I asked, "Is there anyone you like?", I was surprised! ! A surprising brother complex! ! I teach my virgin sister how to have sex with her, and then she fucks her raw and creampies her!