I have been with my girlfriend for 5 years, in the last 6 months we have been having sex with a friend of hers, at the start was just sex but then she was always coming over and spending time with us. Over that time we have all gained feeling for each other. We had talked about this recently and everyone was on the same page of how we felt about each other, so we thought we’d give it a crack and date her. All is well and I know it won’t be easy and need good communication. What I’m more so asking is there any tips to help everyone feel happy, or like unwritten rules you should have to keep things equal, for example I took the new girl out on a date the other night and I said to my original partner that I should take her out separately next and then so on with them two alone.

Is there any other ideas of such?