I'd love to see a video where your girlfriend brings a slutty friend to help out for whatever reason (spice up the bedroom, or perhaps your GF wants to 'save herself' or something) and the slutty friend pushes her limits.
Like it could start as the agreement is only a handjob, but the friend escalates to a blowjob, convincing your girl it's ok.
Then, penetration, but it's condom only.
But the BFF takes it off.
Finally ending with a creampie or something, and your GF being mad.
Something like this: https://www.pornhub.com/view_video.php?viewkey=65f008fdd8470
Alternatively, you could seek the help of the BFF to help with the relationship, and she "calls the shots" to you and your GF, calling you both sluts, and being generally femdom and controlling the scene.
Something in this spirit: https://www.sexlikereal.com/scenes/unruly-submissive-part-ii-8897
