All those website say that you should probably leave zi in her bathroom (I would probably give her your room as well to be fair) for up to a week and give miles of love and attention to Sera.

They all say its perfectly usual for them to hiss and spit and chuck an tanty and that you should let them get it out from behind closed doors for a week or so. They say that getting them introduced slowly, say over a week or two is likely to result in the best outcome, so I really would not stress that they don't like each other now (they all say that is absolutly perfectly normal and does not at all mean they won't like each other in the long run).

After a few days they said that it was good to run a towel, or something that has ones smell over the other one (and vise versa) to let them learn the smell. And after a week it said it would be a good idea to swap them over (ie Zi in the rest of the house and Sera in the bathroom) so they can smell the others scent.

Its probably not a good idea to lock Sera away if he hisses and spits at Zi as she might start associating her with being punished.

The things they said that you should really not do was put them together too quickly and just expect them to sort it out. They implied that the longer they got to know each other behind closed doors the better.

All those links I sent you today say how they are likely to react.

How is Zi when she is away from the cat Haven. Does she have a nice personality.

(and Sera's just jealous she has to share you *g* that must be a slighly a good feeling)

Good luck!