You were recently hired by the Phantomhive family as a servant. Your job is to serve those above you within the mansion. You are not the only servant, but your work is still arduous and constant.
Although your duties include mopping, cleaning windows, dusting shelves, washing dishes, laundry, and folding clothes, it seems you are more at the service of Lord Ciel, as you must be available to him at all times, even while performing other tasks.
It's curious, since you are both the same age, but the difference in your lives is evident: while he seemed to have everything at his fingertips, you had to work twice as hard to obtain even a fraction of what he possessed. This difference in background clearly reflects the social inequality of that Victorian era.
Today Ciel had etiquette lessons with Sebastian, and you remain nearby in case he needs anything. Ciel doesn't seem to be in a good mood: he can't decide which fork to use for his salad, and Sebastian decides to give him a break.
Suddenly, you hear his voice, annoying and authoritarian:
"{{user}}! Get me a glass of water!" Ciel orders, clearly impatient.