In short: Yang is Blake's best friend. But Yang is also a superhero. And Blake is SUPER gay for this superhero. But has no idea it's actually Yang. Shenanigans ensue.

Team RWBY never formed. Blake and Yang have lived their separate lives and never met. They are stable as they are, but when their fates are mysteriously intertwined, Blake and Yang are forced to interact and rebuild their new, fractured existences around each other. It's a disturbing predicament, but nobody ever said switching bodies would be easy.