threesome advice??

My boyfriend and I are having our first threesome tonight (fmf) and I'm excited/nervous. I feel fairly comfortable because the girl is someone I matched with on tinder a year or two ago, before my bf and I started seeing each other. She's bisexual, but leans toward women so I don't feel threatened. Does anyone have advice on how to make this night fun, jealousy-free, and not awkward? 😊