Direct approach

You spit. "Fuck subtly, I want to **** her soul."

Malabeth laughs. "I couldn't agree more. Let's make that little cunt one of us."

You strut toward the dungeon where Angel is being held. You and Malabeth walk in like the goddesses you are.

Angel sees you in all your demonic glory. "Oh god no. I'm so sorry, BJ."

"Sorry?" You say sexily. "This..." You run your hand across your perfect midsection. "Is what I wanted. Don't you think I'm hot?"

"I won't let you cleanse me. I can easily resist your charms."

You laugh. You slither up next to her, while Malabeth attempts to make eye contact. You caress her inner thigh to distract her, and jam your cock tipped tail into her mouth. You barely manage to move it around before she bites down hard. You cum from the delightful pain, shooting a load down her mouth. Angel repeatly spits trying to rid herself of your venom with little success.

You step back sit down and slide a finger in your pussy and begin frigging yourself.

You watch as Angel keeps trying to avoid eye contact with Malabeth. She closes her eyes. You laugh quietly. With her eyes closed the aroma of your sex will be so much stronger.

You watch a drop of sweat form on her brow and smell the earthy aroma of her sex growing moist.

Despite her protestations, she is bisexual enough to have been influenced by your powers. Now with your venom inside her you can practically see the sapphic lust building within her.

You pull Malabeth to you, angling her pussy to give Angel an optimal view. You begin licking.

Malabeth moans. "Fuck yes! Suck it you fabulous whore!"

You sense, rather than see, Angel's eyes flicker open. She is treated to a vision of Malabeth squirting you face with black, oily, demon girl cum.

Her eyes have a faraway look and you sense her weakness. You glide up her.

"Would you like to play Angel. We won't cleanse you. If you promise to play, I give you my word I'll free you."

In the barest whisper she repeats. "Just play?"

"Of course. My word."

"Y...yes."

"Then taste my sisters sweet sex."

You grab her bonds and with preternatural strength you break them. You pull her into a kiss. She recoils at the taste of Malabeth. You hold her tight until she begins to appreciate the flavor. Soon she is nearly licking your face for more of Malabeth's nectar.

"Mine tastes even better, Angel."

You lower her to floor and sit on her face giving her easy access to your pussy. She doesn't disappoint. She begins licking you aggressively.

With your magnificent body blocking Angel's view, Malabeth begins her work. She slides her tail deep into Angel's pussy. She squeals into your sex. Malabeth then settles in, tailfucking her, licking her breasts, and sucking on her hardened nipples.

You reward her with copious amounts of your sweet pre-cum. You could cum anytime, but you hold off letting Malabeth drive her into a frenzy of lust.

Finally, Malabeth senses she is ready. She slides over your leg and whispers in her ear.

"Taste her essence."

You cum preparing yourself. Angel begins to devour your juices and your essence. You open yourself pouring as much darkness into her as you can manage. In a moment Angel realizes her mistake and stops. You smile. It is much too late.

You feel weak and empty from having Angel feast upon you. The pit feels you emptiness and quickly opens to you. In moments you feel perfectly wicked again.

You get up off Angel.

You smile at her. "You are free to go. Unless of course you want to go another round?"

You could simply mind fuck her at this point. However, a decision from her to damn herself would be so much more...satisfying.