Finally I've managed to draw (a bit sketchy though) my guys together!

So they both are my sonas. Yusha (the marten) represents my current personality and appearance. Corvin (the serval) represents the character traits I'd like to have.

They don't have any background story, but I can describe their relationship as supernaturally intimate, they share the same thoughts and feelings and emotions, although they usually look at things from a different perspectives.

Corvin also can have this "reversed" colors: https://www.furaffinity.net/view/35672740/
And Yusha can have yellow eyes like he has: https://www.furaffinity.net/view/31301744/