I suspect that Bruce was also one of the reasons Stacy and Doug broke up.
Actually it's hinted. Stacy wanted to do better so she broke up with generic Doug to be with Bruce (the rich popular kid). She thought it'll advance her career & life but found out that Bruce isn't better than anything other than having a big dick & his money. So she ended up as a dance teacher. Doug actually tries to tell Raffa about Bruce's short comings (he isn't a typical cuck, he likes when someone praises/compliments him) to show his superiority but she always cuts him down. Which is why she was so shocked when Bruce lost to Jim in the pushup dare.
Also don't know if it discussed but after Matrix in popular culture Red Pill means "Harsh Truth/Reality" while Blue Pills means "Blissful ignorance or Oblivious simulation".
I think the Matrix metaphor is intentional by Dev as in the Dark Knight Trilogy movie night Bruce says to Raffa:
1st movie he is in control
2nd movie everything goes chaos
3rd movie is about his resignation, and embracing it
To which Raffa replies:
That's really interesting I feel like sometimes this idea can be applied to real life too...
Bruce: it's all about accepting the darkness within yourself
In the truth or dare game she is already telling him not asking for permission or anything anymore:
"I guess I'm telling you, because I know you'll accept"
And if you refuse the trial Anal she will keep insisting to which Doug will say:
"Babe no, stop insisting"
Also she wasn't acting angry when Doug point out Erik showing his dick to Raffa, she was really angry cause Doug was making a scene until Doug let her know it was acting from his part.
And after the bath scene she confessed every second she spends more time with Bruce's cock she loves it more.
And if she goes into shower with Bruce, after hearing Doug thought they were having sex she says:
"E bello (It's nice) to know you're ready for it."
I think she would have go for it and pressed for it if she thought she was ready enough to take the big cock in her ass.
I think in the High Lust Blue path if Doug didn't gave her permission to Anal Fuck Bruce she will truly go behind his back, or if Doug is too pussy she will break up or make him a cock-caged cuck.
Only in Low Lust Blue path with Alpha Doug she may not go past anal sex. Don't know what the outcome of Low Lust Blue path with Beta Doug would be.
In the red route I think she already got split-roasted by giving Erik a blowjob while getting ass fucked by Bruce.
And if you read Erik's messages he always points out things truthfully like how at the end of update she don't think giving Blowjob is cheating anymore.
I mean at this point her hand, mouth (both for kissing and blowing cock), thigh, Anal sex and pussy job (gave one to Erik) isn't considered cheating anymore (most of them started without consulting Doug or later putting words into his mouth)