I don't tell Sheldon stories; we have conversations. Goes something like this

"Hello Sheldon"
"Meow"
"How was your day?"
"Meow"
"Did your brother behave?"
"Meeeeeeoooooooow meow meow"

He'll talk back for as long as I care to carry on the conversation.

Got home last week from a couple days away and he went on and on. Ah the joys of having a Siamese cat (or at least part Siamese).