Tabitha seems to be coming round to him, despite herself. Mornings and evenings are now punctuated by cat races around the house (yesterday, I had to move a bewildered Robinson from the place in the hallway where he was being trampled by two sets of thundering paws). Yesterday, I actually spotted the two cats wrestling, and howled with laughter when Simon launched himself from a chair onto Tabitha's back, actually escaping without a pounding. Tabitha is very vocal, and given to screeching as if being murdered when she's only playing. I am getting used to this, too. Tabitha still thumps Simon regularly, but it is with claws sheathed and seems entirely in a not-very-successful effort to put him in his place.
My only concern is that Tabitha may be feeling a bit displaced in my affections. I try to give her lots of love, but she's staying a bit aloof. Also, Simon is extremely affectionate and likes nothing better than to snuggle - it's hard when Tabitha comes chirruping up for a cuddle and Simon is already there. I think I may leave Simon shut in the study with his breakfast in the early morning, because both Tabitha and I are missing our morning ritual of purrs over the laptop and her finishing off my cereal bowl. Simon will be annoyed, but I think Tabitha's needs come first.
However, all in all I'm delighted with this new member of my family, and so thankful that I happened to be in the right place at the right time to find him.
By the way, I think he's twice the size now that he was when I first got him, and he has big paws. And he eats like a horse. I suspect he's going to be large.