If it's a private class, I'd relax and do what the person wants- if he's happy to sit around chatting, then do that, but sharpen your skills with using conversation as a teaching skill- build links and reminders across conversations, etc, without getting him worried by homework he'll never do.
I have private Tagalog classes and my teacher and I end up chatting, and she can get a piece of homework out of me about once a month. Every so often we go on a back-to-basics study drive, then end up chatting again.