So this is a hard one that i've been dealing with for a few years. Gf is BI and more interested in girls so we both date other girls but she doesn't date other men, under the agreement that her close friends (that are coincidentaly smoking hot) are off the menu. One of her best friends (who lives with her and pays rent to my gf) is not only a smoking hot sub but also smarter and more successfull than her. Ever since she introduced us to eatchother she seemed to be flirting with me, she also brought me many good business deals. Me and her friend now spend more time together than we do with my gf but have a silent agreement to try and keep that detail to ourselves. So if i made some advancements with her friend it could potentialy lead to eather an insane shitstorm or landing a 10/10 girl. I think they both know about the position and it seems that her friend doesn't mind, gf however gets somewhat competitive and will talk shit about her friend to me. The cost of the shitstorm would be however insanely high as it would not only cost me about 30% of my social circle but also many future business deals. Her friend seemed to take her guys before but is straight and wouldn't allow me to keep dating other girls if we were to end together.

So my questions are:

-Is it a trap that would mean her friend's interest would drop if we'd sleep together?

-Is there a way to test her best friend if she's prepared to go all the way without puting it all on the line?

-would a drunk one night stand with her friend cause her to start the shitstorm when i'd get back to my girl in the morning?

i know the deal is great and i enjoy dating other girls a lot but the girls in my gf's social circle are all eather 9s or perfect 10s (the supermodel scientist types you'd want a family with) while im pulling 6-8s so the risk is somewhat justified.

This one is for the old red pill community, thanks for you advice!