In the second-floor bedroom, the twins sat on the bed. They knew exactly what was happening downstairs. Kaede was fuming. "This is my house!"
"Rin, don't you care?"
"Not really," Rin said, looking at her phone. "I knew from the start Alex wouldn't be just mine. This succubus won't be the last."
Downstairs, the "experiment" had reached a new stage. Eri was using her lips, tongue, and breasts to serve Alex.
"Darling, does this feel good?" she asked with a mouthful of him. The slurping sounds filled the room. Her demonic instincts made her a natural at deep-throating.
Alex gripped her hair and thrust his cock deep into her throat, making her eyes roll back. "Mmph!"
Any human girl would have gagged, but Eri used her tongue to massage him even as she choked. Alex began to fuck her mouth rhythmically. Squelch, squelch.
Her saliva dripped down her chin. Her skin was flushing a deep, erotic pink. Alex snapped his fingers, releasing the hypnosis.
Eri's eyes cleared. "Mmph... gurgle... Alex-kun... Husband... HUSBAND?!"
She realized she had been manipulated. Her husband wasn't this big! But the pleasure was already overwhelming her common sense.
"Alex-kun, stop... wait... UNGH!!"
He held her head and blasted his hot cum directly into the back of her throat. Eri was forced to swallow the massive, high-quality load.
"Gulp... this taste... it's so powerful..." She was dazed by the life energy in his semen.
"Just an experiment, Madam," Alex stroked her face as he pulled out. Her lips were red and swollen, coated in white. "But you want it too, don't you? You've held back for so long. Show me your pussy."
Slap! He smacked her ass.
Eri's resistance was gone. The lust Alex had ignited was too strong. She crawled into a doggy-style position, presenting her soaking wet entrance to him. "Alex... kun..."
"I'm coming in."
PLAP!
"OHHH—!"
He buried his entire length in her in one thrust. Eri shrieked, her eyes instantly turning back into hearts. This wasn't hypnosis; it was pure, unadulterated ecstasy.
"So big... so hard... so HOT!"
Alex didn't hold back. He pounded her with everything he had. Eri's demonic physique allowed him to let loose.
"Is this a succubus?" Alex grunted, thrusting wildly. "A normal man would be sucked dry, but I'm different. How does it feel, Eri?"
"It's good... so good! But too much... too intense! I'm going to die! I'm cumming!! Ahhh!"
Eri Morita felt the true joy of being a woman for the first time in her life.