Slave serving a Mistress

My knees ached, my feet ached, even my toes ached. My mouth was dry and my
tongue felt like sandpaper. My eyes were red and irritated. I was miserable
and in pain. But those were all secondary feelings that I was having. My
primary emotion, the one that overwhelmed me and that outweighed all of the
misery was elation, excitement, and arousal. Mistress Sarah had left me alone
in the house, alone, with instructions to be naked and on my knees when she
returned home. Mistress Sarah didn't tell me when she would return, and I knew
that it was in my best interest to follow her instructions to the letter.
Actually, I didn't have a choice in the matter - Mistress Sarah owns me, mind,
body, and soul, and when she tells me to do something, I do it.