I mean, and this is my opinion, I think the whole drawing a gun on Jamal no matter what kind of ruins her corruption to a large degree. GG was very much falling in love with Jamal and deeper into the gangbanger lifestyle. What was already dubious consent at best, with mild degredation, is now certainly full on rape and much more extreme degredation.
The BBC gangbang could have happened with the prior themes of GG not particularly wanting to go through with it, but not really putting up strong opposition either. Pulling the gun on Jamal elminates any such notion that she might have been a willing participant. The gun recontextualizes every one of her decisions moving forward into one of complete reluctance rather than semi-relectance. There either should have been a third option to confront Jamal without the gun, or have a choice just before to pull the gun out from hiding or not.
Even better, have a choice later on if GG leaves the gun hidden to shoot Jamal's friend that's trying to kill him to cement her corruption.