be careful what you wish for
Power corrupts. Absolute power corrupts absolutely. I have seen it time and time again. A young man who wins his love begins to want the love of others. A young woman seeking to change the world for the better instead destroys it. The story never changes, and humans who gain access to my power only abuse it.
Many aeons ago, Tristran was benevolent. A young djinn bright-eyed and eager to please his masters, he helped many a man rise to power. But what they did with that power, with the power Tristran had given them...
After several centuries, he became jaded in humanity. He still grants wishes, but he translates them as literally as possible, usually to the shock and dismay of his masters.
If anyone is able to get a third wish in, they're lucky.