Staging is super, but the script could have been finished in a more interesting way, for example, either the awakened girlfriend would have thrown the friends out into the street, or even joined them and looking at her friend obliquely would have screwed her boyfriend much cooler than a mulatto!
What else are sisters for? They're just for my brother to practice on her, to relieve his tension. Then he could achieve something in life instead of hanging out in dubious companies. And the sister won't be shortchanged.