Fond memories

This a true with the real names of those involved.
It was mid summer and I was on my way to pick up my baby bother, he was actually 24 at the time, anyway even though it was 8am it was warm so I only wore my work shorts and a T shirt....as I entered his drive way I could see the kitchen roller blind was up and a dim light was on.
Now Stephen my brother is married to a real good looker at the time of this story they had been married 3 years. Pam his wife is an absolute stunning woman a size 6 at most lovely looking tit's not to big, just the perfect handful, long brown hair to her shoulder blades and the most beautiful blue eyes that you could loose yourself in.
Anyway back to the story...I parked up and got out of my pickup and as i was walking past the kitchen window, I noticed my brother completely naked with his wife Pam also naked bent over the kitchen table face down, and Stephen was fucking her hard from behind.....well I kinda froze to the spot, and couldn't help but watch as Stephen slammed hard into her pussy, she was moaning loud as I could hear her from outside, then I came to my senses and started to move of.....but to late Stephen spotted me like I was a some sort of perv.....but rather than be mad he gestured for me to come in.
Well I entered the kitchen as silent as I could and with the music playing Pam didn't know I was there let alone in the kitchen, Stephen then indicates for me to take of my short of and as I do he is still fucking her from behind, she is moaning so loud telling Steve to fuck harder....I'm standing behind them with a hard on like a steel rod just watching these to young people fucking....Steve steps back and pulls me forward, I guide my cock into her wet pussy and instantly slide balls deep into her, she moans again, within seconds I have mounted her and ploughing as deep as I can to get my cock into her, all the time Stephen is smiling from ear to ear and Pam hasn't a clue that it's me her brother in law who is actually fucking her.....that is until I moan out load and say....holy fuck Pam you feel great....Pam's head swings on a pivot "what the fuck"....the only thing I could think of was to ram my cock balls deep in her, to which she says " holy fuck don't stop"....and I don't I continue pounding into this 20 year old pussy that's as tight as a glove and as wet as a waterfall....then I shout I'm going to cum......give her a good load James.... is all I can hear from Stephen......jesus don't I'm not on anything Pam says......it'll be fine I put and load in you half an hour ago, my swimmers have a head start.... Stephen smirks. And with that I emptied my balls in her....it was fucking fantastic
That started something that lasted for a few years sometimes the three of us and more often just Pam and me.
Sadly my bother was killed in a crash some years later, and Pam and I never got together after that....just didn't seem right.
Pam had a baby girl 40 weeks after that encounter...I often wondered who's the father, but after Stephens death I stuck by them like that girl was my own, and I made sure Pam had all the help she wanted....she never remarried, and I was never married but at least I have fond memories