So what I'm getting from this post is that someone needs to write a Mystery/Erik (MystErik?) Blood Bowl AU fanfic?
It's obviously a rivals to romance fic, with Mystery as the cool veteran player and Erik as the hot headed newcomer. The question is are they on the same team or not?
Different teams is the classic tale of rivalry with their passion building on the field with someone getting tackled and being surprised by their opponents beautiful eyes, shining amidst the mud and blood of the field. Same teams means a much more psychological build up, with lots of Top Gun style locker room tension and so on.