Responses
Pretty sure little bro was just a lost kid who spent a bit of time under white fox's care lol. The black panther did say that he was the second son of an affluent family, so the little brother probably just got back to his actual family
Also very possible. I look forward to how this plays out. It's obvious from the colour scheme that the seme is the little brother.
I'm guessing little bro lost his memories and was adopted. They're a different species, so it seems they were brothers in name only.