Robert Greene's The 48 Laws of Power:

Ninon knew that men and women are very different, but when it comes to seduction they feel the same: Deep down inside, they often sense when they are being seduced, but they give in because they enjoy the feeling of being led along. It is a pleasure to let go, and to allow the other person to detour you into a strange country. Everything in seduction, however, depends on suggestion. You cannot announce your intentions or reveal them directly in words. Instead you must throw your targets off the scent. To surrender to your guidance they must be appropriately confused. You have to scramble your signals—appear interested in another man or woman (the decoy), then hint at being interested in the target, then feign indifference, on and on. Such patterns not only confuse, they excite.

TL;DR - You conceal your intentions. Hint at interest in her, then hint at interest in another man or women. Patterns will confuse and excite.

Mark Manson's Models:

One can flirt by being clear with one’s intentions as well. One can state one’s sexual desires clearly or actually even move to make those sexual desires happen. It’s counterintuitive, but this can generate a lot of uncertainty and sexual tension as well.

For instance, let’s say you meet a woman and just come right out and say, “I think you’re beautiful, I’d like to take you on a date.”

A lot of men cringe at this idea. Needy men hate it because they think it will make them creepy. Narcissistic men hate it because they believe they’re giving their power away.

But in reality, it’s one of the most powerful and practical things you can say. Not only is it vulnerable, as we’ve discussed at length, but it also builds far more sexual tension.

But how? If she already knows you like her, how can it build tension? There’s no uncertainty. Oh, but there is.

TL;DR - Be open about your desire. Vulnerability is attractive.