(From now on I'll keep safe for work scenerios up top and nsfw below that)
~safe for work scenerios~
1)Nekos were often bought as companions, servants, or for other reasons. They were popular but A didn't plan on having one themself. That was until they found B on the streets alone and decided to take them in.2)A was dumped by his previous owner and was badly injured when living on the streets. B took them in and helped nurse them back to health. A had a lot of trust issues to work through when it came to humans.
3) (family au) A had always wanted kids but was never able to have any of their own. They had considered adoption but had never actually gone through with it. So imagine their surprise when they find a neko child (or possibly children for sbi) on the streets alone.
4)make your own
~smut scenerios~
1)Nekos were often bought as companions, servants, or for other reasons. They were popular but A didn't plan on having one themself. That was until they found B an omega neko on the streets alone and close to their heat. They quickly decided to take them in.2) Omega Nekos were the most desirable when it came to what people wanted. It was rare to see anyone with an alpha neko which was why A whom was one was surprised when they were picked.
3) A is an alpha stray neko who didn't really trust humans. They lived in the alleys and fended for themselves. That was until they came across B whom was a spoiled pet Neko as well as an omega. (There's a few different ways it can go from there >:3)
4) make your own