My wife (45) and her best friend (46) will pick random times to visit each other and hang out. My wife and I (50) work from home so her friend will come over during the day. They can be incredibly childish when together so I find something to do while they have their girl chats. I was working in my office when I hear screams of “ewwww!”, “so gross!”. I go to investigate what they’re screaming about. Both are laughing and giggling as normal but giving me a strange look. My wife’s friend had caught her son masturbating which prompted the screaming. I just chuckled and said “boys will be boys”, when her friend asked me how I learned to masturbate. I looked at my wife, who is usually very reserved, and she had an inquisitive look on her face. “I don’t know, the same way girls learn I guess, you touch it and feels good”. Both protested immediately “ I never did that”. I laughed out loud. “Whatever,” I said and began to walk away. “Wait, seriously,” her friend said, “I don’t know where he learned it”. I sat down and my wife chimed in. “Yeah, i know you do it. How did you learn?” I jokingly said “It would be easier to show you!” My wife said “don’t you dare!”, her friend said “I fucking dare you!” “Okay”, I said, “I started jerking to porn”, I got out my phone, found something fairly hot and started rubbing my pants. Silence. I look over my phone and both are staring. They are sitting separately on our couch and loveseat, each with a blanket covering their legs and waist. I’m in my recliner. They are almost in a trance. I was getting turned on more by the second so I just pulled my pants and underwear off and sat down with my feet up. I describe to them how good it feels to stroke up and down. I’m really hard now and starting to leak. They become totally silent. I can begin to see movement under both blankets. Knowing they’re rubbing their pussies and getting wet like me , i tell them how id watch the porn and imagine the woman doing things to me. I was getting really close and had no plans of edging. I could hear the wet noises coming from both of them. I slowed my pace, and felt my cum building inside. I started cumming and moaned out loud, shooting 4 or 5 ropes of cum on my shirt and the rest running down my hand and balls. They both had orgasms almost at the same after i shot. Both fully clothed and under their blankets, their bodies convulsed and they whimpered, both with beet red faces. It was actually so hot knowing I made them both cum just be watching me and not touching them. I smiled and said ”any more questions?” I wiped off with my underwear. And walked away. They still have their little girls time, but no mention of our “lesson” and no indiction anything will happen in the future.