There are a couple of Kobold scenes.
The first one you get by being small, waiting until he reaches his 2nd stage, and then complimenting his muscles.
For the second one you need to wear the wizard hat (the cobra gives it to you if you compliment his outfit). Then you need to talk to the kobold about either his hat or his hobbies and then compliment his muscles (if you are small and he is still in his first stage this will result in the first scene).