Opening the cabin door she leaned against it's frame, taking a look at Dante as he fed from his vials unaware of her presence. Her hatred of him began to rise as her eyes turned blood red and her fangs lengthened. No not here, there will be a time for this but not now. Finally announcing her presence she said, "I doubt that's enough to keep you docile for your entire time here" she laughed as Dante jumped back to see her before replying, "...what the hell are you doing here Tirean!" 

She chuckled as she fully entered the cabin, closing the door behind her she said, "The Elder sent me, why I am here is of no current importance to you, filth. But while I'm here I might as well have fun with you" she gave a sinister smile before moving towards his blood vials. 

"If anyone here is filth I'd be you, you're the pathetic lesser vampire..and a seductress at that", Dante could feel his claws embedding into the bed as he sat down on it. Isabella turned her head with such speed you'd think there was no bone. She composed herself before saying, "I may be a lesser but you are a lord..an illegitimate lord at that...and I doubt you've shown your little pets your true form yet. Would you like me to tell them?" 

Dante jumped up from the bed and stood an inch from her face yelling, "Don't you dare! I swear if you do I'll-"

"YOU'LL DO WHAT?! Kill me? No that would be bad for your friends to see won't it. So until the time comes for that you will play along with my little game or I will reveal the monster within that pathetic human body of yours. Are we clear?" 

Dante kept staring madly at her before backing off and retracting his fangs and claws. He had no choice...for now. Isabella made her way to the cabin door saying, "Good, now I'm going to go find the others. Care to escort me, brother?" She laughed as she extended her arm towards him.

So this was the game she wanted to play. Brother and sister? He had no choice but to play along with her.