Wife has her second only cock

My wife was she married me at 23. Ok she' her me suck her tits and rub her clitty but that was it.until my 28th birthday a few weeks before our wedding day. Well roll on 20 years and we are still.happily married and still fucking. Anyway my wife had a new friend who was single but desperate to.have a kid so she was basically shagging anything. Well my wife used to stay at her friends quite often as she lived in town and we lived a way out. And they'd just go a pub and so forth a nice girls time out together.
Well this one time I had to pick my wife up after closing time so I said I would collect her at midnight.
Midnight came and I went to town to her friends flat. I rang the bell but no answer.I could see a light on and the door was unlocked so I went in and up the stairs to the flat. As I went in I could hear some grunting and moaning noise and I assumed it was Sally my wife's friend with her latest pickup but as I crept past her room I could see in and she was stark naked on the bed and her guy spent next to her. Fair play I thought. But I could still hear creaking and gasping yes yes yes and I recognised my wife's orgasmic voice. I opened the living room door. It was dark but enough outside light to see this guy on top of my wife giving her a good fuck. They obviously didn't know I was there and I watched him tense up as his balls shot his load deep into her hairy pussy. I retreated not knowing what to do. She had been a good Catholic girl who I had to sexually awaken and now here she was giving that treasure of my to some stranger. I left the flat and waited in the car. Eventually the guy left. It was someone we knew. I went back into the flat. My wife was still lying there legs wide apart. I turned on the light and I could see the guys jism still seeping out of her red swollen pussy. I had to admit was turned on and my cock throbbing.. she woke immediately and started to try and say sorry. But I wasn't interested in apologies. I pulled her up turned her over and over the arm of the sofa and slid my cock into her sloppy cunt.