Allotment Fun

As many times a week as we can both manage to get free (2-3), I meet Alan down at the allotments.
We do attend to our respective allotments and growing produce, but we also fuck in his shed.
Depending on time, who's wants fucking and who's hard first, one of us will suck the other, then get ready to be fucked.
I mostly receive Alan's larger cock, but I do fuck him at least once every four or five times we have sex.
Some days Alan's that horny I go home with two or three loads up my arsehole and or down my throat.
We're both in our fifties and love our respective wives. Yet like him, I've been having gay sex since I was in my teens.
Every so often Alan's wife drives down to visit her sister and stays over a few days. That's when I visit his home and we fuck like rabbits for hours.
We're both more than happy with our arrangement and don't see us stopping anytime soon. And the reason I say this, is both my and Alan's wife know we're fucking. They've both said similar things to us "Don't cheat with women. And don't fuck when I'm around".
It's an 'agreement' Alan and I fully understand and something we both won't go against.