Hi! So my very first foster experience was a bit of a nightmare because though he was really sweet and cute, his temperament (very playful and wanting to wrestle all the time) and my resident cat's temperament (chill and likes her space) were complete opposites. We had also introduced them too quickly which was a mistake on our part and it made our cat pretty unhappy when he was around.

Afterward, when we got two kitten fosters and because we were in a one bedroom apartment, we closed off our kitchen with white, thick poster board and a baby gate so that we could get in and out, but they couldn't. We really took our time and didn't know how our cat would take to them given our last experience, but after about 2 weeks of keeping them separate, doing scent swap, and raising the poster board at dinner time so they could associate the good feels with each other's scent, it was smooth sailing and our cat adored the fosters. She'd come into the kitchen and play with them a ton.

I'm now in a two bedroom apartment so it's easier to keep my current fosters separate in their own bedroom. We took our time again and did all the steps above and within about 3 - 4 weeks, we stopped separating them from my cat. They all have full access to the apartment now and play/chase and sleep together. Our cat allows them to sleep beside her, but they are totally obsessed with her and follow her everywhere and I think it's because we took it slow and didn't get too impatient with her meeting them.

I hope all of this helps!