Innocent and Badass

Mackenzie Murphy and Ethan Dolan.
Mackenzie is a VERY innocent 18 year old.
Ethan is Mackenzie's brothers best friend since they were four. He always have admired Mackenzie's innocence.
Mackenzie is fresh into college. Her brother threatened the administration office war if she didn't get a dorm room with Ethan, the only person he trusts with Mackenzie.

What will happen in their dorm room experience?