So my girlfriend of 4 months has recently come out as polly. She said she was fine with being monogamous for the time being, but wanted to move for more people in our relationship. Recently she has been at our house a lot and when we had some alone time once, she brought up letting my step sister (2 years younger than us) into our relationship. I had a weird gut feeling but I wanted to be accepting so I said I would think about it. That was a week ago and I’m under constant pressure to give and answer, and I’m afraid if I don’t she’ll go through with it anyway. Does anyone on this sub have experience with poly relationships or a similar experience that could help?

~r/teenagers