Friend or Foe? (Serial Designation N x Serial Designation Z)

Little fanfic for fun, my Twitter has more info about the main character Z who I'll use. Gonna mark this as mature cuz I'm gonna be typing most of this when tired and also for a just in case measure. (All art will either be by me or will be credited, cover art however is by me)
Twitter is @itsyaboitimber, I'll be posting updates about this thing's progress as well.