I and my girlfriend have been living together for a while. Tomorrow she will go on a four-day trip with her family. My girlfriend has an older sister named Saeko, and today she came to hang out with us. Due to work commitments, Saeko couldn't go with the family. But that night, while I was sleeping, I was awakened by... Saeko sucking my dick! And the next day, when my girlfriend and Saeko left, I was lazy at home lying on the couch when someone rang the doorbell. And sure enough, it was Saeko. Unable to resist her beauty and invitation, I crazily fucked her just as she wanted! And for the four days my girlfriend was away, Saeko and I were like a couple in love, spending the whole day eating and fucking, and she even allowed me to ejaculate inside her womb. I thought this relationship would end when my girlfriend returned, but no, Saeko moved forward and kissed my lips, as if to say that our relationship would continue...