I declare this day Holiday From Bite (a riff on mrguy's Holiday From Hate).
Boy Kitten is a biter. Super orally fixated, he loves to bite things, chew things, and also mount things. We've never had a humper before, but apparently bk is a humper. Good times!
Because of the bitey bitey bitey problem, and because he may or may not have put his big brother in the hospital a few weeks ago via infected bite, I sought the counsel of a cat behaviorist. I can't continue to separate the animals for the rest of their (hopefully) long lives.
The cat whisperer seems nice. He's covered in tattoos, some cat-related (ex: "cat's meow" across the knuckles). He works with the local animal shelter to advise them on the socialization of their cats. We zoomed our meeting.
He says that the best thing for bk would be another bk, but otherwise we need to give him more enrichment. Toys are on order. And then we need to distract him from the other cats, so that he can learn that there are other things besides humping and they can learn not to fear him. Good luck with that.
I have many cat toys on order, but in the meantime mrguy found cat apps, and he loves them. Cat Alone 2, you are awesome. bk especially loves the water drop game. You put your device on the floor and start the app. Imaginary water drips from a pipe and if the cat steps on its picture, the drop splits into droplets and makes a satisfying sound. He loves water and he loves fake water also. He licks his lips while he plays and sometimes licks his paw. He can play with this thing for an hour without getting bored.
According to bk, however, Cat Alone 2 will never take the place of humping.