AU in which:

Jungkook would very much like to get into a certain babes pants.
Taehyung is an innocent bean who misunderstands who is who.
And Jimin is his long lost best friend who is supposed to be there (but is instead sleeping in times of great distress).

Or: Taehyung comes back from America to live with his friend Jimin to learn about their ancestral traditions, but instead has a very strange encounter with his little brother instead.