Release
Though the conditions to turn one into an eternal demon seemed quite troublesome, Blake was finding that this hardship was only present when the target hated him.
The requirement for one to be an eternal servant was simply an instance of genuine subservience.
All the target had to do was decide that they would be subservient to him, and it didn't matter whether or not they planned to betray or even kill him after, the deed would be done.
After showing Solara that she didn't have many paths to take and that her death was a possibility, predictably, the woman decided to take the logical option of being under Blake and bidding her time, a decision that instantly doomed her.
Picking Thalia off from the floor, Blake threw her on the bed, smiling as the girl got into a proper cat stretching pose, her body pressed to the bed and ass properly raised up, waiting for his meat to destroy her.