Returning to my hometown after a long time living in Tokyo. Because my parents were away, only my younger brother was at home to welcome me. Unexpectedly, in just a few years, her older sister has become an extremely attractive woman! I couldn't take my eyes off her hot body. Knowing that his older sister was extremely naive and trusting easily, he decided to trick Mary so he could fuck her! He lied that women who don't have sex for three years will have their hymen closed and become virgins again, this is called "second virginity". Because I was afraid of the feeling of losing my virginity for the first time, I asked her to check. Just waiting for the chance, I continued to commit my wrongdoings with my innocent sister...