4some with friend

I M37 was having a drink with a friend M35 celebrating his birthday (belatedly). One thing led to another, and we ended up at a brothel where we went into the same room with two women. We've been friends for a while and are close, but we had never been naked in front of each other. My dick isn't small, but the guy pulled out a huge dick that I don't even come close to in size and thickness. He is white and skinny, so I wasn't expecting it at all lol

I enjoyed myself with both women, but I can't deny that I was really turned on watching him fuck. I even paid a bit extra for one of them to take it in the ass just to see her struggle on his big dick. I had never felt this before, but I didn't feel the urge to take it from him or suck him off—it was all visual. Could I be bisexual, or was it just the heat of the moment? I had never done a group sex before, so there was also that novelty, I don't know.