The power thing. Knowing you have this little [whatever he did] bitch cowering, begging, and praying to the fluffy creatures for his life. That is second only to keeping some bitch locked in a cage, periodically torturing it, giving it time to recover, and then torturing it some more.
Unfortunately, this society has "standards and practices", so I gotta get this fix making unimportant bitches cry and abusing the homeless.