First, get your Paragon or Renegade status level as high as you can before accepting the Justicar's loyality mission.
Second, accept the mission and lure Morinth at the Afterlife VIP club. When you get to her apartment after convincing her to take you there, follow her conversation carefully.
During that time, your Renegade and/or Paragon status will unlock thenew options availble to you. If you do use them, you can have a hidden choice cutscene where the Justicar and her daughter Morinth are fighting.
During that time, you'll be offered Morinth's help OR the Justicar to continue your missions.
Chosing Morinth will give you an ending game bonus of the Biotic power - Dominate. Be warned, however, Morinth is deadly if sex is involved. Meaning, Instant game over.
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