For when she wants a backrub and you want sex…
She lies on her stomach with her legs together. You enter her from behind with legs outside hers, then bring your knees around so that you are basically kneeling over her ass with your cock inside her. Then you massage her back, shoulders, neck, arms and ass.
To make paying attention to the massaging harder, she can playfully wiggle her ass or clench her vagina on you while she giggles. Try and hold out as long as you can without getting into wanting to head towards your orgasm.
When you’re into the hard thrusting part of the game, she probably has her face turned to one side. When you come, be kissing her firmly on her upturned cheek.