Get sucked stealthily.

It's a false alarm. Though Kara shifts in her sleep, she doesn't wake. You breathe a sigh of relief, even as Marissa does not let up on your cock.

“I don't know what the issue here is.” Marissa says softly, jerking and licking your member all the while. “If this Kara can't accept you for what you are, spending the rest of your life around her will be awfully boring.”

“There aren't many women who'd accept this!” You hiss, though you make no effort to **** away your mother's touch.

“All the more reason to spend time with me, dear son.” the demoness says, giving you one of her most wicked smiles.

“T-these aren't bad.” you admit, reaching out to close your finger around Marissa's rightmost horn. You stroke the black, bone-like material in appreciation.

“Mmhm, you've always loved Mummy's blowjob handles, haven't you Edward?” Marissa says teasingly, before returning to orally pleasuring you. It was impossible to deny. Not long after you had first consummated your relationship, you had lost entire days to just getting sucked off by Marissa.

“I do.” You admit feebly. “I love every part of your body, mother.”

Marissa smiles, her lips wrapped around your thick, hard prick.

“How could you not?” She enthuses, rising to her knees, showing you every bit of her glorious purple body. “You're a smart boy, you've always acknowledged the superiority of the demonic form.”

“How could that pasty barbarian next to you possibly compete with this?” Marissa asks, running her hands down her bare torso. “A body straight from the hells, built to please, corrupt and control you mortals.”

“She couldn't.” you whisper, lost in the moment. “She fucking couldn't.”

“And don't you ever forget it, Edward.” Marissa reminds you, before returning to her ministrations.

Between the demoness bringing all her considerable carnal talents to bear on you, and the taboo allure of this all happening while Kara slept next to you, it isn't long before you feel your body betraying all decency, and giving up your seed for your mother.

Stifling a groan, you spurt, again and again, into Marissa's mouth, and onto her face. There's a look of unbridled glee and enjoyment in her red eyes. You know it well, the look she gets when she's pushed you to do something you previously considered over the line.

“Good boy.” Marissa coos, once your shower of semen abates. Tracing one taloned finger across her cheek and chin, she scoops up any remaining traces of your issue, and swallows them down. “I doubt it if either of my sisters have a child as... pliable as you, Edward. We shall see soon enough.”

Not quite understanding her meaning, you have **** but to take the demoness' words as a twisted compliment of sorts.

Marissa makes to gather up her dress and leave, before turning her attention back to Kara.

The Beathan still slumbers, her nakedness only partially concealed beneath the palace's silk sheets.

Marissa strides around the bed, coming to a crouch on the other side of it, looming over the princess. You can scarcely breathe.

“She's pretty enough...” the demoness muses. “Perhaps there's a way we can keep her around.”

Reaching out, Marissa strokes at Kara's ginger locks with a single delicate finger.

“Countess Marissa's served me well, but I'll have to discard her as a disguise eventually.” the demoness notes. “I've never masqueraded as a warrior woman before, that... that could be novel.”

“What are you suggesting?” You gasp, a sinking feeling in your stomach.

“It's simple, Edward. We do to young Kara what I did to Marissa Loon, all before you were born. I'll take her form, live as her, see how much fun I can have in her stead.” Marissa whispers in a wicked tone. Flicking out her forked, serpentine tongue, she gently traces it across the sleeping Beathan's cheek.

“Hell, you can still marry her if you want.” Marissa suggests.

“No.” You insist quietly. “She's a good woman, and I care for her. I can't-”

Holding up a few fingers to shush you, Marissa stares back at you with a merciless expression.

“Edward, my dear son.” the succubus notes. “You're half-demon, half-king. There's nothing you can't do. Never use that word.”

With that, Marissa pulls away from the softly snoring princess, making for the other side of the room, and her discarded dress.

“Anyway, just a thought.” Marissa notes. “I must be off now. But take care. My father may summon us sooner than expected.”

Dressing with the practiced ease of a lifelong whore, Marissa transforms back into her human disguise, and slips out of Kara's bedroom, leaving the two of you alone.