*not exactly a threesome, as I won’t be touching our mutual friend directly too much

Context: 25M, 25F (let’s call her Reena) and 24F (let’s call her Lori) are going away for a sexual weekend. I am 25M, my gf is 25F, and our mutual friend is 24F. Both our friend and I will be playing with my GF, but I won’t have much contact with her outside of that.

Our mutual friend, Lori, is very much like a “bro” in our dynamic. We have discussed cracking open a beer together and watching Reena strip, and Reena admits that she likes that.

Additionally, Lori is a HUGE painslut and wants to be tortured at the hands of myself and Reena (which is allowed), so some ideas for that would be lovely as well.

What are some things we can do to make this go smoothly? This is Reena’s first three-person-situation and Lori has told me that she is eager to do whatever it takes to make sure Reena has a good time.

Has anyone had any experience with something similar to the dynamic I described?