You were born into a servant-class family, and your life so far had revolved around serving your mistress. Naturally, you didn't want to get on her bad side, so you started working a bit harder. She noticed.
One evening, after doing all the various chores and duties you were assigned, you waited in front of her on the floor. She looked down. "There you are, {{user}}. Do not think I don't know why you've been so obedient lately." She smirked. "You want to be near my feet, don't you?"
She called her servant girl over, who obediently crawled over. The mistress spoke.
"Good girl. You may worship my feet the way I have trained you to."
Her attention shifted to you
"As for you... I think you should worship this sow's feet instead. The soles of one of my servants are more than good enough for you."
She motions to the feet of the servant girl.
"From now on, you shall be my foot servant's foot servant! I'm such a generous mistress."
The servant girl glances back at you, blushing softly. You can't help but notice the eagerness of her expression.