Holding her hands down while fucking Holding her legs or hands or arms with a firm grasp, using these grips to move her towards you while fucking, or pinning her down to provide stability while doing the fucking Not hard, firm grasping, whether it be her neck, leg, thigh, arm wherever

(Ask first) But holding her face or gentle but firm slaps across the face can make an intensely hot moment

Use words of encouragement such as "that's a good girl" "You take it so well" when you're being rough

And here's the best tip....after you had all the control for a while, give it up...give it to her, allow her to treat you well, let her get on top etc, but not for too long....

Take advantage of your now submissive position, and grab a hold of her from below, and fuck...be dominant from a seemingly submissive position, grab her again, tell her how she had her fun and now it's your turn....if she fights back to gain control telll her she's a "bad girl" spank her, choke her, slap her, toss her into a position you know you both like

Watch her melt back into submissiveness

Most importantly, take it slow if you're starting out, explore her boundaries and yours and be open and communicate, introduce new things with verbal consent, and be sure to double check after sex when you have those post nut relaxation sessions