With out my wife knowing [my intent], I introduced her to a man I wanted to fuck her.
Nice. Very sly...
It took him about a month to seduce her...
She pretended to resist — but, she decided a month was long enough...
Now, he sends me a note every time he is with her.
Hm... this brings to mind a series of 3 short stories on a different site that is or was maintained by "Cuckold Paul" (I think that's what he called himself), entitled "The First Ring," "The Second Ring," and "The Third Ring." The protagonist is an attorney who complains to his boss, a single man who owns a business, about how frigid and disinterested in sex his wife became after their marriage and a couple of children.
His boss says, "Bullshit— married women are the easiest women in the world." Then, he offers the attorney a bet: after meeting his wife, he will successfully seduce her in fairly short order, but the attorney must not do anything to interfere. He stipulates that when the attorney's wife kisses him, he will call and ring his phone once (then hang up). When she kisses him then sucks his cock, afterwards he will call and ring his phone twice (then hang up). When she kisses him, sucks his cock, then he fucks her, afterwards he will call and ring his phone 3 times (then hang up).
The attorney accepts. Time passes. Finally, his boss happens to appear at a social event he and his wife are attending. They meet. Soon, the attorney begins to suspect he may have accepted the bet too hastily and is en route toward becoming his wife's cuckold. You can guess how the story unfolds. Soon enough, most evenings per week the attorney's phone rings 3 times. Soon after, his wife arrives home. She never tells him she is fucking his boss, but she continues to decline to fuck him. After she goes to bed exhausted, he slides under the covers and licks and sucks his boss's cum from her pussy while she pretends to sleep soundly.
You might consider setting up a similar arrangement with your wife's new lover. I mean, how hot would it be to have to listen to your phone ring 2 or 3 times frequently, knowing that if you answer after the last ring there will be no one there, but knowing what it means...?
My wife does not know that I know, but it is so hot to read his [e-mail] notes over and over. And, most important, he is Black.
Excellent. Now that your wife is a well-fucked woman and has reason to look attractive, you might also consider buying her a gym membership. Given that she's a BBW (as you say), maybe she would then become motivated to begin dieting and working out, and would soon be on her way to looking as hot as she now feels.
Keep up your good work...