I've been asked about the plot - i wanted to leave that to the writer, but here's what i had in mind.
The writer meets my wife through a common friend and likes her body. He gets to know from friends that she is sex-starved due to her hubby's 20-days a month travel. After a few friendly meeting writer figures that the prim and proper wife has a potential whore inside.
Slow seduction follows, including several near-misses, until one passionate night it happens. Things escalate from there until the wife is completely whored out.
That's my outline, but i'd let the author choose his own story...