Wait what. I haven't seen that scene! Who is Harold? I'm so intrigued and confused right now... xD
...I honestly don't know why a lot of people aren't up to speed with all the updates, even if they just discovered the game recently. Apart from a few specific instructions to unlock some scenes and routes everyone should know who's who, what everyone's names are and how to unlock major routes.
Barrel = Fat Bandit
Harold = Bartender
Scene is Love Potion with Barrel in the tavern through the submissive option.