Anna finds Smith and Juliet

Smith and Juliet were pleasuring each other for a long time. Then they were suddenly interrupted by Anna's voice. She was slowly walking towards them.
"I see you find your Unicorn, Smith, and I see that she already chose you as her husband." Anna said.
"Huh... Hum, yes...." Smith said still with a heavy breathing.
"Who are you ?! And how did you pass through the magical barrier??" said Juliet with a loud voice. "You shouldn't be here!"
Anna looked at Juliet and said "Calm down, my dear. I'm not here to hurt you. In fact, you are very important to me". She then added looking at Smith with lustful eyes "And to him too".
"What are you talking about, woman?!" Juliet said almost yelling.
"Please call me Anna, and to make things short, you shall become a Bicorn for his sake. It will make him happy, don't you want to make him happy?" she asked with a grin.
"Of course I want! But that's none of your business, woman. Please leave us alone." said Juliet.
"Ah... I didn't want to do this, because I can't control it well enough" Anna said. "Let's hope it'll work".
She walked closer to Juliet, and stopped in front of her naked body, Smith moving aside still overwhelmed by the sudden drop of pleasure. Before Juliet could say anything, Anna told her, staring at her red eyes:
"You shall obey me, Unicorn, of the Centaur Family."
Juliet was instantly overpowered by Anna words. She continued.
"For I am to be the Black Knight, an elite warrior in our ruler's army, the Demon Lord. I shall be her Royal Knight, and you shall stay at my side forever." She took a step back, and ordered:
"Now tell me your name, Unicorn."
She lowered her body to be at the same height as Anna and said, bowing her head, putting her right hand around her left breast "My name is Juliet Wildlight, and I will obey you forever".
"Nice. Very nice. Now, let us begin, shall we?