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!
Well judging by the way she sucked him it seems that she gets high from the very process of taking in her mouth, and of course from taking cum on his face, it's all in her boner judging by all.