Both

I leapt from the bed, my cock hard despite my release, and said, "Curtains up."

Lena blinked, the light returning to her eyes, and she shouted in surprise. Her hands remained firm behind Becca's head, and she kept her older sister kneeling. Drool ran down Becca's chin and tears still shone in her eyes.

"A demon?"

My cock passed easily between Becca's lips and I drove myself to the roots, leaving her **** and trembling in the arms of her sister. "I really should thank you, my dear. You were an easy and excellent ****. All of this is your doing, I couldn't have done it without you.

Lena's eyes opened in shock.

"If I'd tried it with Aina, she might have resisted. But you're so pliable." I stroked Becca's hair as I thrust, offering Lena my most beatific smile. "But you carried my cum home. You spiked their drinks, you dosed them at night, and you placed my triggers in their heads. You made it so easy, you sent your father away on a wild chase, and when he returns home there'll be nothing for him to do."

"It ain't true." Her voice shook.

"You made your family slaves. You'll make your friends slaves." I pulled out of Becca and left her gasping. "Does that knowledge hurt?"

My twitching cock hung in front of her, wet with her sister's juices.

"I can get rid of the pain, you know." I waved my cock under her nose. "The guilt, everything. But it's your choice; I can leave you like this, watching as your body does all sorts of despicable things but helpless to do anything about it. Or, you can suck my cock, right now, and I'll make it easy for you."

"I don't want it to hurt." Becca answered first, leaving Lena to look somewhat betrayed.

I slapped Becca with my cock.

"Lena, it's your choice. But, now you're choosing for Becca as well."

She took a couple minutes to answer, but her answer was to kiss my cockhead. I gave the command and she let Becca go. The two of them were unskilled and innocent, but the circumstance were more than enough to keep me hard as the serviced my cock. At one point Becca's eyes grew hard, and for a moment it seemed like she might choose ****. But my claws, so dark and keen, kept her honest.

"Tits out." It wasn't a trigger, but the pair of them obeyed. "Kiss."

They hesitated for only a moment, their lips meeting at my tip. I grabbed Becca's head and put my cock in her throat, groaning as I pumped shot after shot of cum into her mouth. Lena looked at me, for just a moment, before she kissed her sister and willingly sank into the blissful oblivion of a trance.