Use the stone.

"W-wait Milly." John urges his sister to stay, but she's distracted to even notice, and resume walking toward the front door.

Of course, Milly has a habit of lying and takes full advantage of their trust. Instead of visiting her best friend, she's going to spend the weekend at her boyfriend's place.

John heard rumors circulating at campus, Mike is going to ask for third base during his eighteen birthday. This would be a problem when John wanted his sister's virginity for himself, and eager to impregnate her the same day as his mother.

Without much time to formulate a suitable command John retrieve the stone from his pocket and say, "Milly, you're a horny slut who enjoys orgies, but unable to orgasm unless someone's fills your needy cunt."

The stone swiftly enter Milly's mouth and her eyes dilate without life as each of her emotions had been altered. To ensure there's no resistance, the stone ingain slut on the forehead, and when the word vanished her subconscious perceived it as a primary personality.

Once completed, her body squirms against the door, "Oh fucking god." As images bombarded her mind with countless cock penetrating each opening, she utters, "I need somebody to ravage my needy cunt."

Having difficulty controlling the arousal. Milly unzips the skirt and smoothly slide it off her slender legs. Fully accessible to release some tension, she harshly rubs her rosebud.

"Why can't I orgasm?" Milly wondered and rub more vigorously.

Sadly, no matter how much she struggles to subdue the burning inch, her sexual appetite continues to persist. If there's a sign of ****, she has accomplished it by making her clitoris swivel feverishly.

John smiles by his sister's desperation for release and says, "If you're having an issue getting off. Why don't you join us?"

"An orgies sound wonderful, big bro." Milly admitted, but her commitment to stay faithful prevented her from proceeding, "But I kinda promise Mike..." She blushes from embarrassment, "If we ever decide to have an orgy, it will be with his ex-girlfriend."

"Forget about your sister." Sarah said selfishly as her delicate hands caress his member in a steady motion, "Mommy will take care of your naughty little friend." She chuckles by John's erection, "Oh, it's not little anymore."

Soon his mother engulf his member and the sound of slurping made his cock throbs, but John needed his next load deep within his sister's tunnel brfore anyone's else does.

Milly put on her clothing and says, "I appreciate the offer, big bro. But you need to focus on mom."

Milly reaches into her purse and hand him a pregnancy test.

"Have mom use this, and let me know if you see two lines." She winked at him but then amusingly joke, "If you see three-line, something is awfully wrong with her conception."

Even though his sister's humor about the test is implausible, the statement isn't too far off from the truth. And if the device is capable of displaying more than two lines, it would undoubtedly occur.

Unable to convince his sister to join, and lose the chance to pop her cherry. John has no other option but to use the stone's power.

"Milly will fall desperately in love with me, and won't be jealous of other women," John say while rubbing the stone.

The stone's magical energy sweeps into Milly's collective consciousness and she screech as her emotions have been manipulated.

Once the ordeal is over, Milly hungrily gazes at her brother and says, "I will only have an orgy with you in one condition. You need to accept me as your girlfriend."

"Sureeeee...I don't mind being your boyfriend." John reply gleefully.

"That awesome," Milly say and warmly hug him.

John has many hugs before, but nothing this sexual. He can feel the warmth of his sister's breasts pressing against him, and her heart beating rapidly. This is the same type of affection his mother had given him when using the stone.

"To make this relationship work, we need to be honest and communicate with each other." John says, and Milly responds without hesitation, "I fib on occasion, but it won't happen again....promise."

"Mom, can you tell Milly what we're planing for your conception?" John directs his mother to explain.

"We agreed to have triplets and then sextuplets and so forth until we figure out how many babies my body can handle."

"Whoa, that's going to be a handful." Milly says and nervously ask, "Do you want me to have the same pregnancy?"

"Actually, I wanted to change things a little bit, and start off with six." John says and turns his attention to his mother, "Will that be okay with you?"

"Of course, dear," Sarah respond and wearisomely glance at her daughter, "But your sister hasn't experienced labor, and I'm afraid multiple conceptions might be harmful."

Milly sadly frowns at her mother while arguing, "That's so unfair." She huddles John's arm and drags him to her bedroom, "I can keep you satisfied too, big bro."

It appears Milly's devotion is similar to her mother and the complications of inbreeding didn't cross their mind. But John wanted to know if the stone's influence can be reverse.

"Mom's method is reasonable, but can you make your pregnancy a little more exciting?" John asks while examining her expression.

Milly felt uneasy by his question and ask, "Ummm...what you mean by 'more exciting' big bro?"

"Well, I was thinking it'd be fun to take some risks. You know....start off with eight offspring."

Milly's body shiver against his arm and nervously says, "I love to have a large family with you, but having eight offspring at once is unhealthy." Not wanting to see his disappointment, she shuns her face away and mutters, "I think we should follow mom's method."

John reaches into his pocket and uses the stone, "Milly has a pregnancy fetish."

The stone infiltrates Milly's mind, and she presses her hand against her forehead to subdue the aching pain.

"Are you alright sis?"

"I'm.....fine...big bro. Just a slight headache." Milly responds and then lowers her eyes to feast on his member, "But I need your cock in my tight-little-virgin cunt."

Milly quickly discards her clothing and pushes him onto the bed. She glides her body on top of his and assists his member into her soaking fold.

"Ugh...your cock feels so good babyyy." Milly says and begin to sway her hips.

Even though Milly's hair strand conceal most of her expression. John briefly saw a wicked smirk upon his sister's face. He realizes this is no longer the sweet sister he once knew. The person on top of him is a sex-craze-sadistic-demon control by lust. Neither less, he's fascinated by the stone's results. Giving someone's a fetish remove a part of their inhibition.

"Do you really want me to carry eight babies, big bro?" Milly asks while her interior wall tightly squeezing his member.

John held his sister's hips to eventhe momentum while answering, "Yeah, I still want it."

"Having octuplets sound like fun." Milly enthusiastically said without consideration due to the stone influence.

Milly smile by his excitement and made a suggestion, "I have been thinking. Do you want to make my first pregnancy extra special?"

John knows where this is leading and ask coyly, "What do you mean by special?"

Milly lustfully curls her lips and says, "I want to be on fertility, big bro."

John places Milly's hair-strand above her earlobe and saw a mischievous grin.

"I think you're being dishonest, sis."

"What gives that away?" Milly humorously joked and say, "Alright, I want to overdose myself on fertility pills. Feel better?"

Feeling her brother's cock throbbing within her womb, she encourages, "You wanted to make my pregnancy exciting. Well, this is your chance." She purrs in his ears, "Just imagine your baby batter swimming inside my needy cunt, looking for an ova to fertilize."

Their mother wanted to burg into the room to protest, but the stone rewire her emotions. There, she stand by the door with her fingers sliding in and out of her slit.

"Agree with her, John." Sarah softy whimpers while lustfully curling her lips, "Make your stupid little sister carry your spawns."

John knows what he's doing to his sister's emotions is wrong, but having her desperately conniving him to fertilize an unknown amount of ova entices his hunger cock.

"How many ova can you release?" John asked while struggling to maintain release.

"That's the best part of misusing fertility pills. It could be eight ova or maybe several dozens." Milly honestly replies with a devious expression, "But I perfer to fertilize as many ova as possible." Giggles, "If we're really lucky, my stomach will run out of space within a few months."

"What about abortion?"

Milly glare at her brother and say, "Seriously bro, you're thinking about abortion? For once, be spontaneous and let things happen naturally." Giggle, "Besides, you wanted risks. I don't think there's anything more risky than resuming development when there's no more space."

John realizes the true capabilities of the stone. It didn't just remove a person's inhibition, but enhance the effect.

"Oh god, thinking about your sperms entering one ova after the other is making me so fucking wettttt." Milly says, as cold shiver rush throughout her body, "Ugh...cum inside me, big bro. Impregnate your slutty girlfriend."

John pins his sister on the bed and hurls, "You want me to impregnate you?!!" He slaps her ass and swiftly clog her tunnel, "Fine, but you better develop the pregnancies to the very end."

Milly smile by his attempt of aggression and say, "I promise," Her body twitches by his ****, "If you promise to mess up my tight little cunt."

Incapable of holding the tension any longer John pushes his member into the depth of his sister's birth canal, and his body shudders from the eruption. When his orgasm subsided, he reaches for the stone to reset his sister's emotions. But suddenly, a thought occurs to him. The stone can manipulate a person's mind, but can it make their body adapt?

John lustfully gazes at his sister laying exhausted on the bed and wonder what it would happen if he uses the stone in this particular way. Will her stomach tightly compress by the ever-expanding pregnancy, or stretches accordingly for each offspring? This he wanted to know, but if the stone didn't work as intended, Milly's body will undoubtedly be overwhelmed within a few months.

Wanting to know how much time he has before making a decision, he asks, "Umm...sis. When will you be on fertility pills?"

Milly put away her cellphone and reply, "I text my friend who works at a pharmacy and he said it fine to drop by tomorrow morning. But there's one problem though, he's not allowed to give any **** away." Giggle, "So...we made a deal. If I clear out the inventory before his shift end. I don't have to pay a single pill."

"And if you fail?"

"Oh..he said something about having a magical stone, and transfering my body with Natasha." Milly reply and laugh, "Isn't that the silliest thing you ever heard? I don't know why he even hang out with that freak. I mean....even if it possible. I can't imagine what she'll do with my body..."

"W-wait a moment, back up a minutes. Did you say a magical stone?" John ask with fear and interests.