me as a 14 year old have already gone through this and the way your reacting is understandable but do push or force your child to talk about ANYTHING or else your child could easily end up having anxiety and depression just try to wait it out and now that it has be this many years it is a good time to PERSONALLY see a profesinal but DO NOT involve your son because it could easily begin the process of anxiety.... This is all based on POV because the same thing happened to me...
I think its supper hot! I remember when i was 14 and I did it with my friend but I didnt have a screwed up father who just busted in my bedroom door. For that you should be ashamed of yourself. If you need to know your sons business you could have asked him when his lover left after they were done. Hey does he know that sexual position you like or do you eat of your wifes p***y? I dont think so.
Bad father!
Just join in next time and f**k them both.
Did it turn you on? Were they going to stop or continue? Let them. They are probably gay so if you were turned on join them.