Neutered cat mounting?
I have a three year old cat named Kiara (girl), a seven year old cat named Angel (girl), and a seven month old kitten named Panda (boy). Kiara was pregnant for awhile with 5 kittens, but we had to abort her as suggested by the vet (she was outside for a month fending for herself when she got pregnant, very unhealthy and malnutritioned. Cat caretaker's fault while my mother and I were on vacation). Anyway, Panda was nursing on Kiara for a few months, but FINALLY stopped recently. And I noticed recently that he sometimes mounts her. Like he'll put all four legs on each side of her, hold her neck with his teeth, and start a kneeding motion with all four feet. She, of course, escapes or pushes him off after some growling and slapping. But he does not do this with Angel, at least not that I've seen.
What's the intention of his mounting if ALL of my cats are fixed?