When she gets a new slave, she needs to get him used to her. Rather than just talk, she puts her slave in the tub. Before the bath water is finished running, she pisses in it. She wants her slave to bathe in her piss and get her smell into his pores. She pisses in the tub the entire time he is bathing so that he can get a fresh dose to bathe in.
When Queen Lucilla takes a bath, she makes it personal. She makes sure she opens her legs and pisses in the water. She loves to see her golden piss change colors in the water. When she sits back down, she loves knowing that she is using her piss to clean the filth from her body. She loves the smell she is left with on her newly freshened and cleaned skin.