Caught my younger brother on a sex chat

My name is David and I am twenty-six years old. I have a twenty-two year old brother, Paul, whom I really like. We are true friends from the very beginning. The four years difference between us does not change much. I no longer live with my parents though. Paul still lives with them. It is actually better for him because since I moved out, three years ago, he has his own room. We used to share one room and I have to admit that it was a bit troublesome because I was always the guy who liked women and I used to bring a lot of girl friends to our home. However, Paul used to be there sitting in front of our computer screen and playing games. I do not have to write about how it ruined so many nice opportunities, do it? Anyway, I visited my parents and Paul the other day and stayed there for three days. One night I came back home quite late and I caught Paul chatting with some girl on a sex chat and, I have to admit, it got me pretty stunned. I mean, I would have never expected it from him because he always used to be this calm guy who would play computer games all the time. It was actually quite refreshing to see that he likes women and wants to chat with them. I hope that this sex chat is not the only place where he chats with women.