Try slow dancing with ya girl before sex. Yes it is corny as hell and she will laugh but you be serious but be good natured. Just give it 2 songs. She will be confused as hell but I guarantee that joint will be like a damn slip and slide. A dude put me on to this and I have loved it ever sense. Trust no dude will ever do it.
When you put it in go slow and DON'T put it all the way in. Give her half. Start slowly and then work your way into deeper faster strokes. If she pulls away at any point you know that is too deep and should insert short of that point. Stay there until she asks for more. If she says she is about to cum keep the stroke at the same pace. Don't go faster or deeper, just keep the same pace.
Jewels. Your welcome.
PS Be cool with the dance. Don't tell her what you are doing. Just put on some music and get to it.
PSS This ain't a porno breh. Pay attention to what she likes and doesn't like. Her body will tell you everything you need to know.