It’s hot to do things like this. Of course you don’t mean it, but you have fun saying it because it’s hot in the moment. Once you do it, make clear later on saying, ‘you know I make you say those things because it’s hot, in the end I’ll decide when you get out’ just to make it clear it’s playing.
So try it today, make him ask for something really extreme, just because it’s a hot fantasy.