My girlfriend and I have been living together for a while. Tomorrow she will go on a family trip for four days. My girlfriend has an older sister named Chiharu Mitsuha, who is coming to visit us today. Because of work, Saeko-san couldn't come with the whole family. But that night, while I was sleeping, I was awakened by... Chiharu Mitsuha-san sucking my cock! And the next day, when my girlfriend and Saeko-san left, I was lazily lying on the couch at home when someone rang the doorbell. And sure enough, it was Chiharu Mitsuha-san. Unable to resist her beauty and invitation, I fucked her like crazy just like she wanted! And during the four days my girlfriend was away, my sister and I were like a couple in love, eating and fucking all day long, and she also allowed me to ejaculate all over her womb. And I thought this relationship would end after my girlfriend returned, but no, she came forward and kissed me on the lips, as if to say that our relationship would continue...