Simply for the cool factor I wanted to have my humanoid cat person tri-wield: one sword in each hand and a third in their tail. But would it be scientifically possible for the cat-person to have enough control over the tail to hold a blade (or possibly other weapon) and use it effectively enough for it to be worth it (otherwise naturally the cat-person will just use their tail to fight in other ways)? Ignoring of course the mechanics of dual-wielding itself; I simply want to know how, if at all possible, a cat's tail could be made able to hold a weapon without magic (see below).
I could simply ask 'a wizard' to do it with magic because this is a fantasy setting, but it seems much less... cool. Plus I'm interested in the science basis of a prehensile tail.