I think anyone with enough imagination to write stories could probably plan scenes/playtime for people, with a bit of practice.

It's just a matter of finding the right person to practice with. In fact, if you could find someone with a webcam, you can setup a playtime for them while chatting to them - it's quite fun! It's amazing how erotic it cane be, when you can't even touch them. Of course, it can be equally frustrating!

Even if it's just finding out the things they most like to do, and throwing a slight twist into it, changes it and keeps it evolving.
Variety is the spice of life!