The gauges run on a 0-100 score, player on the left, tame on the right (I will make it more obvious in the next major update).
If the player gets to 100 first, they can choose more and keep training until the tame gets to 100.
If the player clicks finished or the tame gets to 100, it's over.
If you choose a sub action and fail, your demeanor goes up instead of down. And the opposite with dom actions. Succeeding with either moves the demeanor in the direction you chose, sub or dom.