I'm a college student, and I finally have a girlfriend and am spending fulfilling days. One day, my girlfriend decides to go home to her parents' house for a few days. It's a little lonely, but there's nothing I can do about it. I was thinking about how to spend the night alone when I got home, and there was my girlfriend's female friend in front of the entrance. She had a convenience store bag filled with alcohol and snacks. For some reason, I decided to have a drinking party with my girlfriend's female friend in this situation where my girlfriend is absent! I thought, "Isn't this bad?" but the girls were drinking at a high pace. In the middle of it, I got a phone call from my girlfriend and I was stammering. I just wanted to end this drinking party without anything happening! But then the girls suddenly said they wanted to stay overnight!? A female friend suddenly approaches me late at night. But I refused, saying, "But I have a girlfriend..." However, in the middle of the night, I was attacked again and defeated... I ended up having sex with her... From there, it didn't stop! I ended up having a 3P and welcoming the morning. I thought I was going to leave, but the girls didn't leave... In the end, we kept fucking for three days and three nights! I was about to be crushed by my guilt towards my girlfriend. But I did it... Because I can't experience such stimulating sex with my girlfriend...