You need to increase her immersion into the sex. Drive her wild by constantly teasing her(and not giving her what she actually wants) and holding her down. Be dominant, be aggressive, but also be a giant motherf*cking tease.
Run your fingers over her body but avoid all the hot spots. Avoid her nipples, instead run your fingers around them, avoid her vagoo, instead, run your fingers over her thighs and very closely to her outer labia. When she wants to jump you and ride you like a horse, push her back, pin her down, and deny what she wants.
From there on, work your thing. Run your fingers and tongue over her, still avoiding the hot spots. Tell her if she's a good girl, she might get some, but only if she is a good girl. Ask her if she's a good girl and if she will listen to your commands.
Don't push her limits too hard. Let her get used to all the extra attention that comes with it, and use THAT to drive her crazy. Flip her over on her stomach when you got her all hot and steamy, pin her hands on the bed so that she is on her stomach, and slowly let your c*ck run over her back, buttocks and down to her vagoo and then slide it in very very slowly while kissing / licking her neck. She'll be up for doggy the 2nd or 3rd time after this. Same with all the other stuff. Don't push too hard, just make her suffer first and then do something new so she cannot resist the want to get off and allow you doing it.