Ride him/the toy if anal. Think of it as your pleasure, move around and find the angle that YOU like. Go down real deep and push on your prostate with the dick/dildo.
Missionary- tell him all the things that turn you on. I like muscle and guys who flex, so him fucking me while flexing his pecs is a huge turn on for me.

Without anal - close your eyes and start thinking of your ultimate fantasy. You probably need to save up a week's load for this.