Well, it didn't really happen like that, but I prefer that fantastical explanation since it seems more believable than what really happened.
Anyway, onto Blackie's homecoming!
Isis checks out the box. "Umm, Zeus...I think we have company."
"Yep, I was right! Did you find out if he's got all of his shots? He can't be here otherwise!"
"Blackie, I hate to get personal so quickly, but you did get all of your shots, right? Give me something I can tell Isis so she shuts up."
"Tell Isis I'm a special breed called Ceramic Tabby. Ceramic Tabbies are...hmm...infamous for their natural immunity to all forms of feline diseases and infections. Yes, that's it!"
"Ceramic Tabby, eh? Natural immunity? I gotta sniff this to believe it."
Blackie breathes a sigh of relief. "Thank goodness she believed it! I really want to stay here! I don't want to go back to the post office!"
"Bah! She doesn't have any power here anyhow. C'mon! Let's play some with the mousie! I've been waiting a long time to play with you."
A big special thanks to Derby for sending me my new friend! I will treasure him forever, and sooner or later, so will Isis!