Karen is my junior, a smart, beautiful, cute, and incredibly innocent girl. Today Karen and I were assigned to negotiate with the client. Because of my subjectivity, I almost ruined my job, fortunately Karen was extremely sensitive and won the contract. After that, the two went to celebrate together. Because it was too much, I missed the last train, and my phone ran out of battery. Karen asked me to go to her house to recharge her phone. Because I thought, if I don't do anything, it will be okay, so I agreed. When I got home, Karen immediately wore a loose, off-the-shoulder shirt that kept her breasts hidden in front of my eyes. Since Karen usually wears a suit, I didn't expect her breasts to be so big and beautiful! Knowing that I was peeking, Karen immediately confessed her love to me. It turns out that she has liked me for a long time but has not dared to confess. Unable to resist Karen's seductive beauty, we fucked each other at night, and Karen also let me cum in her pussy over and over again. Although I feel guilty towards my girlfriend, Karen brings me a joy that I have never known before...