Loved watching my friend jerk to my wife’s pictures

My wife and I had some friends over a few weeks ago. We drank a lot and it was a great night. My one friend drank too much to drive home so I offered he could sleep on our couch. Everyone else left and my wife went to bed and we stayed up for one more. He started telling me how hot my wife is (she is very hot). Conversation started to make me uncomfortable about how he thought she had nice tits and wanted to see them, but I also started to get really turned on by it. He asked if I had pictures of them. I said yes. He told me to show them to him. Never really had this experience or turn on before, but I got really turned on that he didn't ask, he told me to show him her tits. I showed him of course, and the next thing I knew he was jerking to all of the dirty pictures and videos i had of her. Told me what to show him. He has a huge cock and it was so hard for her. I couldn't stop looking at it. Told me to get a pair of her panties and he came all over them. Hottest thing I've ever seen. Woke up the next morning like nothing happened.

I haven't stopped thinking about it. Even jerked thinking about it multiple times.

Is this a normal turn on? Not sure how to proceed, but want to do it again.