Responses
![](/images/home/manga-img-anonymous-30.png)
I think he is refereeing to the rules of the house.
For this example cheating can be seen in two ways,
a Forbidden Romance (its only understandable if Big invites people over)
or flat out Adultery (its a problem if Small invites people over regardless of his reason)
Wait, when the men arrived to confiscate the casket, what was Small Master accusing Big Master of inviting them for? And why would it be considered "romance" or "adultery" as he called it, hmmm?