Boundaries. Most important. Figure this ******* out at the outset, keep communication open and tweak and modify as needed.
I see the couple as a team, I’m there to give her pleasure that he cannot provide, at first. If things progress, then we get into deeper levels of domination etc, but then end goal is her pleasure, and mine ultimately, of course.
Thing to keep in the forefront is that this is a lifestyle, I set my boundaries from the start, and if they are breached, it’s over. Unless the chemistry is really, really raw and intense, then it’s expected, but in that case, things get throttled back or take a break. That heat will always be there, you can always (bulls) come back to it.