C18 Her punishment

Elina tiptoes downstairs, glancing sideways like a criminal, just to avoid being seen. How is she gonna address him, that she had been thinking about? Aziel calls him, sir or boss. Sambas is a master. The butler is the sire. Which would she pick?

Master, sir, boss, sire.

She was confused about what to address him with. Calling his name would have been better. But she won’t dare