Disclaimer: I know you’re not supposed to leave a cat unattended with a bunny, so don’t worry. I’ve been careful about this.
My cat, Ozzy’s a bit old, declawed, and fixed, so he’s pretty flaccid. At first, he was pretty shy about Bella. I’d have to pick him up and hold him while Bella came up and sniffed him. Most of their encounters would involve the cat taking a wide angle around the bunny while wandering towards another window sill for super-important cat stuff while Bella would just kind of watch from her precious rug. They started out pretty good, though. Here’s a couple of pictures from their first interactions.
Ozzy occasionally bats at her, but he never gets teeth out. Then again, this is a kitty that never gets teeth out for any reason unless he’s roughhousing with a human (Or, y’know, eating.) She knows how to stand up for herself, though: here’s a gif of a bunny climbing the food chain. Bella also does this thing that freaks Ozzy out where she’ll dig her nose between his back legs. I don’t know if it’s supposed to mean “hello” or if it’s a hormonal thing due to not being fixed (yet) but Ozzy seems to think it’s a little too personal.
They’ve gotten better, though. Here’s a gif from about 6 months ago where Ozzy’s laying there relaxing and Bella walks right up to him. He got paranoid and wandered off, but still. Here’s another example of them being cute and here’s the picture that my profile picture is cropped from.
Just recently I tried putting Ozzy in Bella’s pen to see how they’d react. It was adorable because Ozzy would sort of wander around the pen, looking for a way out while Bella would try to sniff him, then put her nose in the “pet me” position. I’ve also started grabbing my kitty’s paw and petting Bella’s head with it. I doubt I’ll be able to teach a cat to pet a bunny (or anything at all because cats don’t care about what humans want), but Bella probably likes it. Ozzy acts like he doesn’t like it, but I mess around with him all the time and he always looks up at me like “What? That’s it? Mess with me some more!” I wish these fuzzy little creatures could communicate better because it’s clear they wanna be friends.