There's one position that is my favorite!!
The girl lays on her side, then the leg closest to the ceiling in bent at 90 degrees. She can then turn her upper body towards the ceiling so you can see her boobs. Then you mount her with a finger or a thumb in her bum. You can also move her bent leg and bend it more which changes the position of her cervix and hit her G spot. Also if she raises her bum towards you, you can get full balls deep inside her as you finger or thumb her butt. It's the best since you can also grab the butt cheek closest to your face, and slap it.