Well this is just cheating, all this for just a little cheating. The game insist and push the MC to cheat with Debbie so later when his wife will cheat on him it will look acceptable.
But what are the couple doing together in this story, there is not love, they just use to live together. If the MC's wife thinks her husband can't satisfy her why did she marry him anyway?
From that story there is just frustration, anger, humiliation, well those people should just break and divorce, their life would be so much easier!
When a story is about sharing it should be something giving some fun and not like the guy watching his wife getting fucked, beeing hidden the forest through the window, that was so miserable that the MC should have kicked him in the ass !
So the story is well written but the facts are so lame and miserable that i can't enjoy seeing this catastrophy, sorry !