Tease the fuck out of her. It's that simple. The more you tease, the more aroused she gets.
I've said it before and I'll say it again... People appreciate things more that they have to work hard for. If you spend a good amount of time teasing her (to the point where she is literally BEGGING for it) vs. just going for it because you want to get your dick wet and get off, she is going to get that much more pleasure when you actually do stick your dick in her.
Focus more on pleasing her and she will make sure you are taken care of. The same way you "calibrate her reactions" when escalating kino... do the same thing for sex. Be patient. As others have stated, lick her clit and get her going before you have sex. If you don't know how to do that, just spell out the alphabet with your tongue on her clit LOL it sounds stupid but it actually works. This way, you will lick her in using different motions so you can find out what she likes.
If you can't figure it out, send her my way and I'll take care of her
