Phone sex can be a wonderful way for a couple who can't be together to share
intimate time. It is great that your boyfriend felt comfortable enough with
you to try this. Since it sounds like you both enjoyed it, here are a few
suggestions for next time.
1) Remember that there is no right or wrong way to "talk dirty."
That it appeals to you and your partner is all that matters.
2) Reminisce about a previous sexual experience the two of you had that you
found particularly memorable.
3) Tell him what you would be doing to him right now if he was there with you
and ask him what he would do to you if he he was there with you.
4) Share fantasies.
5) Pretend that he is there, and tell him what you are doing to his body and
what he is doing to yours.
6) Describe what you are doing to yourself and how it feels.
7) Tell him what exactly you enjoy about having sex with him.
8) Masturbate together and just listen to the sounds of each other's breath.
If you are looking for more suggestions and ways to get started, you might want
to pick up a copy of Exhibitionism for the Shy by Carol Queen. Much luck
to you. And, remember, this is supposed to be fun, so don't make it a
pressure-filled situation.