Mercy West is a pot star - she's a model who loves to smoke! And in this point-of-view video, you're her boyfriend who inadvertently stumbles in and finds her halfway into smoking a bong.
Shocked to find you home so early, she apologies, starts babbling, and tries in vain to explain why you found her smoking.
And then, in the middle of her explanation, it all changes.
The video interrupts and says, "Wait what? This is better..." and then restarts at the beginning!
But this time, in all her excuses, it dawns on her that you like her smoking. That you like her getting high. And the rest of the video explores that.