PPPE-068 Stealing the boyfriend of an innocent sister

Today my girlfriend's parents were away, so she invited me home to stay the night. Imagining sleeping with my girlfriend, both of us having fun with each other that night, made me feel excited inside. Unable to bear it anymore, the two of us immediately did "one round" first. I wanted to be fucked naked and ejaculate into my girlfriend's pussy, but she refused to let me. There was no other way, I had to wear a condom and fuck her. While I was enthusiastic, my girlfriend's sister suddenly came in. Seeing us fucking, she quickly apologized and went out. It turns out today's appointment was suddenly canceled so she returned. Ms. Non is an extremely beautiful girl, especially her big breasts make any man unable to take their eyes off her. After talking for a while, my girlfriend went to take a shower. Ms. Non immediately came closer and pressed her breasts against me. "You can ejaculate into my uterus too." I couldn't resist her invitation. Every time my girlfriend was absent, she and I stuck together, continuously releasing sperm into her uterus, until... my girlfriend suddenly Came home early and discovered all...