She was not his first kept woman.
He had kept a few young, innocent female juniors from college as his lovers when he had just set foot in society. Putting aside the issue that they already knew about his identity, his open-handedness was enough for those ladies to pester him in buying them branded clothes, bags, diamonds, and other luxury goods. Even when they broke up, those greedy, materialistic girls daringly demanded an astronomical sum from him to serve as compensation and break-up fee.
This woman was truly strange, however.