Cute-and-fluffy animal AU! With a bonus human!Tiernan.
Human!Tiernan: Who’s a good boy? You are! Yes! You’re going to be a fine guard dog, aren’t you, Thorn?
Thorn (thinking): That’s right! I’ll stay alert for all kinds of —
Thorn: Hey! Who’s that? Are you a threat?
Leif: Me? Of course not.
I’m just the perfectly-good pet this home already had. The only pet it really needs. A fine, handsome, very-nearly-purebred cat! With the papers to prove it!
And you’re — what? Some big shaggy rescue mutt? No, I am clearly not a threat to you.
Later . . .
Thorn: HEY HEY HEY HEY HEY HEY
Thorn: It’s not so bad to be guarded by a shaggy rescue mutt, is it?
Leif: I guess I can start thinking of you as an honorary purebred.