Robert's got the right idea. No reason for demons not to use all their well-learned politesse.

You take the hulking incubus's hand and give it a shake, telling him your name. "And I'm his girlfriend, Jess," says your lover, seeming as darkly amused by this thin pretext of manners as you and Amanda.

"Tasty little thing, aren't you?" says Robert. He looks at the pair of you lustfully. "No reason to beat around the bush--my daughter and I got a good look at you two screwing, and, well, we want to get better acquainted. You?"

"After watching you two fuck like filthy animals?" you respond. "Hell, yes."

Jess nods eagerly. "After seeing you laying pipe with your own daughter, I definitely want to see what that cock can do to my tight pussy."

"And you're gonna," grunts Robert, yanking her towards him. You chuckle as you watch your girlfriend make out with this dad-turned-hellbeast, and grab his daughter. Amanda comes towards you with a chuckle, and soon you are kissing deeply and caressing each other while watching your lovers do the same. You marvel at the dark miracle of your transformation--that you can watch Jess make out with another man and only find it hot, that she feels the same about watching you with another woman, that the other couple you're doing this with is an incestuous father and daughter.

After a moment, you pull away and shove Amanda to the ground, placing your immense member between her giant tits. "Ooooh, that's it stud," she moans, crushing her breasts together around your cock. "Fuck my boobs! Treat me like a whore!"

"Oh, I will you dirty slut," you snarl back.

Robert meanwhile has pinned Jess to your car, and is taking her from behind. Her gorgeous ass slaps against his hips as he pounds her. "Oh.... oh, yeah, that's it, that's FUCKING IT!" she groans. Amanda licks the top of your cock with her snakelike tongue, and then stands up, taking your manhood in her hands.

"Come on, you demonic fucker," she snarls at you. "Pound my cunt! NOW!"

You snicker and slide your dick in, marvelling at how tight and wet her pussy is. "You're one lucky bastard," you declare to Robert, "having a hot slut of a daughter like this."

"You're pretty lucky yourself, pulling a honey like this," he responds. He slaps Jess on the rear. "I'm betting you were a fine piece of ass before Mistress Lilith uplifted you."

"Oh, I fucking was," Jess growls back. "And now I'm fucking amazing!"

Your infernal foursome continues, as Jess and Amanda expertly take your demonic dicks, when you feel your balls tighten. You glance at Robert. "You wanna coat these bitches?"

He smiles at you. "Hell, yes." You both pull out of your devilish sluts, and begin to jerk your mammoth prongs. Jess and Amanda coo and kneel before you both, playing with their exaggerated curves to get you off. Soon you and Robert are covering them in your black ooze as they squeal in delight. It fountains out of you, covering them in the tainted substance. When you finally finish, the pair lean into each other and start to lick the hellish juices off each other.