I'm a dude but here is a good idea.

Right at the point when he starts to cum, stick a finger in his ass and hit his prostate gland. He'll cum buckets full and the feeling is similar to a womens orgasm.
An ice cube in your mouth while sucking him off would be good also.
Let him pull your hair and call you names while he's doing you doggy style, that's pretty hot.
Letting him do anal, that's cool also, if he's into it.

Just a few ideas from a guys point of view.

Roger