[Don't oppose him, Spike. He'd be so disappointed. He got stabbed for you!]
These little guys have been growing in number slowly. [He admires the Tease on his hand like the pet it is, stroking it's wing delicately. He thinks they're pretty and elegant, honestly. He couldn't be more proud of his cannibalistic butterflies if he tried.] It takes time to properly breed them, get them healthy and grown.
I'm sure it'd be faster with a human's corpse but alas, that wouldn't be as subtle.