Surely your sister deserves to be re-introduced to Lilith's power.

Not wanting to discharge too much of your considerable power and attract unwanted attention to your presence, you shrink yourself to mortal proportions and cloak yourself in a glamour, returning your appearance to what you were minutes before, clothes and all.

You drop onto the floor and act hurt just in time for your sister to come scrambling back in, with just a pair of panties and a white t-shirt from the supply room on.

"What was that noise!? Are you ok, Sis?"

You grunt uncomfortably and grab her hand as she pulls you up. "I'm OK for now I think. That black smoke from earlier started chasing me but a sharp beam of light shot through the window and when they collided the smoke well' exploded.

Kristin puts her arm over your back and the two of you begin to walk back towards the door. Before you can reach it however, you pretend to stumble and drag your sister down on top of you. You feel a lingering taint within her from her time as a succubus and subtly fuel it with your own power. Above you she blushes with a mixture of embarrassment and arousal as she gets wet looking down at you. Smiling up at her, you continue filling her with lust and in seconds shes sweating and leaning closer to your face.

Suddenly you wrap your hands around her head and pull her into a deep, unchaste kiss. She blinks in surprise and suddenly she's looking into your soulless eyes, your second pair of hands wrapped around her ass, tearing her panties off. She yelps in surprise when your tail slips between her thighs but the noise is lost as you have her face pressed against yours, long tongue in her mouth. You cease kissing just for a moment to breath corruption down her throat. She coughs but then drags you back into the kiss, a hungry glint in her eyes. With your tail pumping in and out of her pussy, her already weakened soul is quickly dislodged and you devour it with ease. Kristin's body quickly begins to change, starting at her pussy and spreading outward. She howls in pleasure as she rips her shirt off to reveal her already growing tits. "Thank you for freeing me again sis! I'll make sure you're well rewarded." She says seductively as she pulls you into yet another kiss. This time however, it's even more arousing because you can feel both her lips and her breasts growing against yours. Within mere moments her smaller horns grow out to lock against yours and you both rise to your feet, your tail making a popping noise as it removes itself from her drenched slit.

Kristin's raven locks flow down to her ass as she fully appraises you. "You're not just a succubus, are you. I've never heard of a demon with four arms before."

You simply laugh at her lack of knowledge. "I am now one of Lilith's inner circle and you will serve her through me. Just because you are were my biological sister does not mean in any way that you are my equal."

Your sister kneels before you in submission and you press your palm on her forehead. You smirk at how quickly she screams in delicious pain as your mark is forever burned into her skin. As you pull your hand back you note it glows like burning embers in the night.

Turning to the doorway once again, you grin. Before we desecrate this chapel and turn it into a temporary headquarters, we'll have to eliminate a rodent.

Kristin rises at your side and you swat her sizeable ass with your tail. "I've been looking forward to hearing that coward's screams as she's sucked into the Pit."