IMs with girl from work

Hey guys, my company has an instant message system. We use it to chat with each other a lot. Obv i try to flirt and tease as much as possible without crossing the line. Today while i was chatting i said something and got a good response. But the next thing i said got a lame one and im not sure why. Any insight would be appreciated! Me: Tell [our boss] to put me back there! Me: Not sure if youd want me back there tho. I wouldn't tolerate any shenanigans! Her: Hahahahahah Her: I would cause you to get in trouble and almost fired Me: That's what id be afraid of. Which is why id enforce strict discipline! Me: No funny business! Her: you know me too well