A Confession About the Threesome I Can't Stop Thinking About (Mumbai)

I'm a guy, and I have a girlfriend who is bi. We also have a close mutual friend who spends a lot of time with us. The three of us sometimes joke and flirt sexually, mostly through my girlfriend.

Our friend and I also talk privately about her sex life, and I even try to help her find someone to be with. But the truth is, I'm actually attracted to her. I'd like to be with her, or maybe even have a threesome with her and my girlfriend.

I feel like she might be interested too. She touches my girlfriend a lot, enjoys being around us, and joins in whenever we flirt. But none of us have the courage to bring it up.

I don't know what to do or how to talk about this without making things awkward.