Here's a save file:

https://www.dropbox.com/s/v1qjqio7vyb85pe/Unsheathed.rar?dl=0

If you load it and go up to Unnis, she won't think your weapon is out. However if you:

1. Load the save
2. Press Tab to take out weapon
3. Press Tab to put away weapon
4. Go up to Unnis

Then she'll think your weapon is still out.