"Master", like a stereotypical maid calling her employer. Kept as is here to distinguish from Bourbon's "Master" (in English).
That's what Tannhauser said yesterday...
...wonder what she went with in the end though.
I'm done with my set of sit-ups!So what sort of training are we going for today?
Goshujin-sama!
Tannhauser!
STOOOOOOPP!!
Next day—
That's just inappropriate in so many ways!Other than the maid-master implication it can also have slave-master, BDSM sub-dom, wife/husband connotations, among others...