[aikochan86]

Is this through a school exchange program? I had a student when I was 15 and one of the things I really enjoyed was sitting and doing our homework together. She had to write a diary in English about what she did each day and then I would check over it for her.

Perhaps you could try something like that? I only needs to be a short paragraph but it will give the student something to work with (as opposed to "teach me something"). And you will then have a hard copy to study over later.

Like others have said, the student might feel a bit jipped if they use more Japanese than English, so it's probably better to have an hour or so of dedicated language exchange time set aside and just use English the rest of the time.