There are men who prefer to let go of respect and honour to be insulted because of extramarital sex.
She's telling him, "Sir, please stop. I can't do what you asking; you are my leader. I respect your wife..."
But he is saying, "I understand, but it doesn't matter; even if it's once, let's do it."
"No, sir," She rebuffed his proposal. But he looked at her sternly.
"See, I will take care of all your needs, buy you a car and give you a good life. Just ask anything and it's yours."
She stood transfixed at the offer. "But sir," She said, but he hushed her.
"Chinyere, leave "sir" out of it. We are adults; call me Mr. Tom."