FSDSS-655 The young man was lucky enough to be taught how to have sex by a girl

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