First, it's call teasing for a reason. The point is as simple as the one you already know: people value more that that do not comes easy.
A better answer, more tailored to this story, is that sex will come when it make sense for the story. No sooner and (hopefully) not later.
Besides, for something to be considered mean, you have to assume that goes against that person's desires. I prefer to be teased the hell out of me before getting released.
Just look at Estate Dominate. That game is hotter than hell, and so far MC has been teased so much that I am surprised he did not die of a heart attack for bad blood circulation motives. Seriously, try it if you haven't. But be warmed, you are going to get horny as fuck.