Show, don't tell. Any fool can write BDSM. A good writer can make the experience exquisite.

Outline your work before you type. Know the beginning, the middle, and the end.

When you don't know if something can work, consider not showing it, because life is the mysterious journey of a hero, after all. Sometimes you can tell an entire story by what is only guessed at it glimpses and questions. Never tie yourself to cold hard data... but have the data and logistics for yourself.