My knowledge on Familiars isn’t great, but I asked Paimon for one after I had hit rock bottom and was in the midst of searching for myself again. Anyways, I started volunteering at a local animal shelter and soon fell in love with this certain cat. However she passed away before I could adopt her due to her health problems and so I just went back to my job of looking after the other cats. About a week later I asked Paimon which of these cats I was looking at I should adopt. Out of no where he said “Curious”, and I thought he was just saying the word curious until I kept looking at the cat names and there was one named Curious. I had never met this cat before, I didn’t even know when he was brought into the shelter he just sort of appeared with a litter of cats. I adopted him without even meeting him prior and oh my gosh me and my cat are like the same person. Curious could not have been a better cat for me, we think and act the same, he sits with me during rituals and meditations, and he understands human boundaries. Often we a have a psychic communication link between us, where we can tell how the other is feeling.
So while my knowledge is limited to my experiences, I received one when I needed it the most, and I believe you can’t simply “ask and receive”, you need to have good intentions and a real need for one, in order to receive a familiar.