Sexy Succubi and Siblings - Part 4

This is short part. Please let me know if you want me to go on. 2 siblings open an ancient tome, releasing 2 Succubi and a huge awakening in their sexuality.

Robert stood in the dimly lit room, his heart racing as the air grew thick with anticipation. His body trembled with excitement, and his eyes were glued to the figure before him—Susan, his partner in a dance of passion that had begun to feel eerily out of control. Her lips, painted a vivid red that matched the crimson hue of the velvet drapes, formed a perfect "O" around his swollen manhood. Her eyes, a piercing blue, gleamed with a mix of hunger and amusement. The scent of their combined arousal filled the space, mingling with the faint aroma of the candles that flickered on the bedside table.

The floorboards beneath their entwined bodies suddenly creaked, a sharp sound that pierced the silence like a knife through warm butter. Both of them froze, their eyes widening in alarm. Susan's hand, which had been tracing lazy circles around Robert's hip, clamped down like a vice. The room grew tense, the air crackling with an unseen danger that was as potent as it was exhilarating. The creak came again, closer this time, and Robert felt a shiver run down his spine that had nothing to do with the chill in the air. He and Susan shared a look that was equal parts terror and excitement, their breaths coming in ragged gasps.

The Succubi blinked their eyes and became invisible. Robert's cock began an incredibly speedy retreat through Susan's body. As fast it was, there was no pain. Both felt growing arousal and even more heightened pleasure.
In just seconds Robert's bulbous cock was back in Susan's delicious mouth.
Susan's breasts had also returned to their perky selves.
There was another creak. Susan and Robert's eyes were locked on each other. What if their parents were back? They had to move fast.
Then they found it was not just their eyes that were locked. Robert's steel bar like dick was not able to get out of Susan's mouth. No matter how they tried. All the manoeuvering was just leading to yet another orgasm.
The invisible Succubi sniggered.
Clear footsteps stopped outside the door and the handle started to turn.

The door swung open, and there they were, their parents, with knowing smiles on their faces. "Ah, we see you've discovered the true potential of the ancient scroll," Robert's mother said, her own eyes a matching shade of piercing blue. His father, a man of few words, simply nodded in approval, his eyes lingering on the scene before them.
Susan and Robert scrambled to cover themselves, but the sight of their parents didn't lessen the arousal that still pulsed through their veins.
"Don't be shy, dear children," Susan's mother cooed, her voice like velvet. "Your father and I are former members of the very society that taught us these... techniques. We've come to guide you through this journey, should you choose to accept it."
She stepped into the room, her hips swaying with grace and offered them an elegant hand. "Let us show you what it truly means to explore the depths of your bond."