Are you used as a "substitute" for her when she is away?

I used to have to "service" Ken if he called when my wife, Diane Jones, was out. This happened quite often as Diane worked part time and odd hours plus Ken was married so never knew when he could get away to make use of Diane.
Diane knew that I sucked Ken off and to completion too, she was more than happy with that even though she did get very jealous if she came home from work to find out she had missed a session with her lover. Sometimes she got mad when I told her how I had knelt before Ken and sucked on his huge thick (and oh boy was it huge and thick, no wonder little dirty Diane loved Ken so much! ) cock, sucked for a long time untill it shot its hot sticky sweet load right down my pansy sissy throut. She would say things like
"Thats supposed to be my fucking spunk you puff, that was meant for my mouth you cunting sissy, that should have been up me, Ken came over to fuck me, fuck my cunt, fuck a woman, not to have his dick sucked by a fuckin queer litttle puff."
The she would realise that, yes Ken had come to use her but she wasnt availabe so he used me instead of going looking for some other slut other than Diane, so she would calm down and make me describe exactly what happened even down to what Ken was wearing !
What Diane did not know was that sometimes Ken fucked me too. Ken fucked me in a public toilet, that was how I met him and brought him home next time we met, to meet Diane, they were instantly attracted to each other,Diane fell madly in love with Ken, he only wanted to use her as is spunk dump and Diane acepted that but insisted that he did not fuck me ever again.
I suppose in a way I cuckolded Diane with Ken ! never thought of it like that before.
Wonder what Diane and Ken are doing now ???