Japhiel's penis is still disagreeing with the tiresome sermon coming out of his mouth. On the other hand, you've already seduced him once, what would be the point of proving you can do it again? You give a demonic laugh.
"Leave, angel." you say. "Leave if you don't want to be a girl. You know that you are powerless against me. You know that I could push you down on that bed and have my way with you any time I wanted to. Shut up and go, or shut up and pleasure me, but spare me the sermon." You exult in the power you wield over this helpless being. "Who knows" you add "You might like being a girl. I do."
Japhiel has shut up and is looking at you in horror, horror mixed with desire.