They never stopped arguing though , and Lilac never chose the vampire over her duty to her Lady , and Murky Water never considered looking into those drugs that could " suppress " his bloody urges . Because they were stil themselves . But in the end , they also became each other .

Question: Why does Murky Water want to suppress their desires ?
Answer: It hurts people otherwise .It is essentially using drugs .It is a bit drug - inducing .It is against Lilac 's wishes .