First threesome tomorrow night what questions should I ask the couple beforehand?!

I’m 24f, bi have been with both genders and i’ve never been into the idea of polyamory until now. Anyways I match with both of the husband and wife of this married couple on hinge and for some reason I’m really turned on by the idea of them together. They’ve done this before, they asked me if there’s anything off-limits and what kind of power dynamic I enjoy, and what else they can provide to make me comfortable. What questions should I be asking to make sure I don’t walk into a disaster?