Flee in Terror

On seeing the two of you in all your infernal splendour, Alexa looses an ear-piercing scream and runs back into the flat. Inside you can see John sitting on the sofa. He is half out of his seat when he sees Dani. Your devilishly-enhanced vision can see his cock immediately harden, but still he stands and says, "What are you doing in my house? GET OUT!"

"Relax," you say to him, in your most placating, wheedling voice. "We're not here to hurt you. On the contrary, we need you... both of you."
"What do you mean?" says John, backing away. While he seems to be listening to you, his eyes are fixed on Dani, who is swaying towards him with an inviting smile on her face.
"Oh, I think you can guess. Mmmm... She wants you, you know. I can feel it from here. She can't speak, but I think you can tell, yes? Now where did Alexa get to?"

Dani reaches John, who stands transfixed as she runs her hands over his chest, flickers her tongue across his ear and then slips her fingers down into his trousers. You leave her to her sport, and head for the faint whimpering sound coming from the bedroom door. You open the door slowly, not looking behind it to where you know Alexa waits, probably with some sort of heavy object held aloft.

"Alexa, darling? I'm not here to hurt you. Well, not unless you want me to, anyway. It's me, remember? The guy from downstairs? We met at that party 4 months ago. I've got something to show you, something you need to see."
You hear the sound of something heavy hitting the floor. Alexa peeks around the door, beautiful tilted nose framing terrified blue eyes.
"Wh-what is it?" she stammers, her face pale with delicious terror. You smile widely.
"That." you say, standing aside to allow her to take in the sight of the Dani-demon frantically deep-throating John's cock as John clutches her head and grunts. Her taloned hands are playing with his balls and pumping up and down his hard shaft when she withdraws him from her throat to run her tongue over the circumcised head.
"John!" she cries, and bursts into tears. You take the opportunity to put an arm around her shoulders, and she shudders slightly as the arousing touch of the incubus has its effect.
"It's okay, Alexa... it was only a matter of time anyway." you whisper into her ear. "It's human nature, you see..." you murmur, sliding your hand across her huge, firm left breast and running your fingers around the nipple, letting your hot breath run down her neck. "... people need to be with different partners, it's all part of human experience."

Alexa catches you momentarily unawares by turning her head suddenly and kissing you deeply. You recover quickly, pushing your forked serpentine tongue into her mouth and grinding your cock against her groin. She responds strongly, rubbing herself against you. You have a live one here...

Before you, Dani has John on his back and is riding him hard and fast, his hands kneading at her massive scarlet tits as she bounces on his hard cock. Her tail-phallus teases and plays with his balls and anus, and her wings flap and ripple with the movements of her body. He is seemingly lost, his eyes rolled up into their sockets and his hips bucking wildly.

Alexa has dropped to her knees in front of you, seemingly intent on replicating Dani's actions earlier. She takes the head of your cock in her mouth, tentatively licking at the tip. She's obviously not very experienced at this, even as willing as she seems.

Of course, there's a lot more you can do to a big titted teenager than just sit back and enjoy a blowjob.