Something exciting in the bed like he wants me play role as if we've just met or a doctor and patient, etc. we enjoy our sex but just to make it more exiting he does so. Normally I don't have much ideas and he expects me to do something new,so to impress him what more exiting things can I do, please suggest

I am not uncomfortable with adding spice in the bedroom. I am uncomfortable when one party needs to impress the other.

Have you watched porno together? Get some good quality movies and you'll get some ideas.

If he's into role playing there are literally thousands of fantasies you can explore.