Oh, I can feel you getting close to the edge.
I won't be pleased if you come!
Does scraping my sharp fingernails all over your cock help you regain control?
Don't come yet, I'll be . . . angry, and I can assure you that you do not want to make me angry! Perhaps it will be best that I press directly into the head of your cock with my fingernails so that you don't come yet. Yes, that does work, doesn't it?