Planning - Protagonists for Narrative

I have chosen to use two of my close friends to act as my 'couple' in the narrative. Both of them are reliable, easy to work with and versatile; making them obvious choices for me. Naomi did GCSE Drama and got an A*, which also shows that she's confident in front of a camera and knows how to make a performance convincing. Due to the fact that the two of them are close friends, there's already a natural chemistry there, which will look less rehearsed than having two people that didn't know each-other very well. Also there is a dramatic height difference between them, making both the Utopian and dystopian shots have a more powerful impact - and giving me more scope to do shots involving lifts etc. After checking their availability I asked them if they'd like to participate, and they're both really excited about it.