Straddle him

The best way to straddle a man is to tie him first to your slave bench/chair.

I tie Ron's hands beneath the bench, his ankles to the legs of the bench and then put a thick leather belt around his neck and underneath the bench.

I like Ron's head to be on its side so usually ask a friend to sit on the side of Ron's head when I ride him. A man is not allowed to watch your face when you take him. Your pleasure is your own concern, not his.