Sister and I got caught fucking

When we were younger, my sister and I used to mess around. She would regularly give me a blowjob and I was eat her out. We got to the point where we would fuck almost everyday after school.

One day after school, we started our daily foreplay and after a bit we started to fuck. All of a sudden the door flung open and it was our dad. He looked stunned and surprised at the same time. We didn’t know what to do so we kinda just stood still waiting for me to get mad. He instead kept looking at us fully naked in bed and then walked out and shut the door.

After that day, he never said anything to us about it or told our mom. I don’t know if he enjoyed the sight or was just completely stunned but from that day we would fuck around even if our dad was there because we thought just didn’t care.

To this day, I still think about that day and kinda wonder if he ever jerked off to the sight of us.