from the end of the balloon to a control panel somewhere behind the her chair. At the connection of the balloon to the rubber tube, another tube with small pump bulb was attached.
'We'll just insert this rubber inside your cunt and pump it up a little,' Jeff said as he fed the deflated rubber into his sister. Deb shook as the touch of her brother's fingers sent chills of pleasure through her aching body. Her brother finished inserting the balloon and was now inflating it deep inside her. Deb could feel it fill with air and press against her tight cunt walls. The rubber tube jerked on the ground with each pump her brother forced into her.
With all her inhibitions lost, Deb squeezed her cunt muscles to heighten the increasing sensations between her legs. This was exactly the uncontrolled hunger Jeff was hoping to cultivate within his sister. 'Within a few days her mind and body would only be satisfied by the most repulsive sexual acts. She would become a true whore's slut,' he thought as he watched his sister desperately trying to satisfied herself on the inflated ball inside her tight cunt.
'That's it,' he coaxed her. 'Squeeeeeze that bulb little sister. I have set the machine to deliver one dose to the ass of your daughter, every time you contract your cunt muscles. I've given you a front row seat to watch the result it has on your children.'
Jeff walked behind Deb and flicked the switch to activate the dispensing device that linked Deb to the device in her 16-year-old virgin daughter's ass. Immediately Deb saw the tube sticking out of her daughter's ass jump as the liquid surged into her daughter bowels. Deb tried to relax her cunt muscles as sweet dripped from her hair and poured down her face and off her heaving breasts.
Jeff walked over to a device on the glass separating the two rooms and pushed the intercom button. Instantly the sound from her oldest son and daughter filled the room. Jeff just smiled at his sister trying to hold her bodies desires still.
On the other side of the glass the 16-year-old Cathy was talking to her brother. 'Ohhh Chris, something's happening. I feel so hot between my legs all of a sudden,' Cathy said. 'Their putting something in me Chris. It's making me burn and itch inside.'
'Try and move up a little,' Chris instructed his sister lying on top of him. 'Try and pull away from touching me,' he grunted. Just then the tubes surged with another dose of liquid and seconds later both Cathy moaned loudly into his ear and rubbed frantically against his stiff prick.
'Shit. Fuck. Chris, I can't help myself,' Cathy screamed to her brother as she wiggled on top of him. 'I don't have any control. I can't stay still. It feels so good. I'm so hot Chris,' Cathy said as her head raised to look at her brother's face.
'Oh Chris I'm so sorry,' Cathy told her brother as she looked into his eyes. 'I can't stop.'
Cathy frantically rubbed her cunt against the length of her brother's hardening cock until the dosage starting wearing off.
'Chris, I think it's O.K. now,' she spoke in gasps. 'I'm sorry, I couldn't help it, I was so hot for you Chris,' Cathy said and laid her head on her brother's shoulder as her excitement settled.
'You have to try and move away from it somehow,' Chris told her not wanting to say cock to his sister. 'See if you can slide up, away from it a little,' he said trying to help his twin sister.
The restraints on Cathy allowed her limited movement on top of her brother. She was held in place by straps at her wrists and just below her knees. Cathy tried to arched her back in an effort to move away from her brother's cock. As she did, the tip of her brother's cock slid down the crack of her ass and rested against the sensitive skin between her ass hole and the entrance to her virgin cunt. Cathy could not pull away any farther. Another dose pumped into Cathy and she wiggled uncontrollably rubbing the tip of her brother's cock against her tender area. Cathy started shaking and began to rub her breasts in circles against her brother's chest.
'Ooooohhhh shit Chris, what are we going to do?' Cathy asked.
'I don't know, Cath, you're making me so hot,' her brother panted. 'I don't think I can take much more. You gotta stop moving like that. It's driving me crazy!'
'Ooohh Chris, I never dreamed it could feel this good,' Cath moaned. 'My whole body's on fire. I feel like I can't get enough. Is it always like this Chris? Does it always feel this good?'
Cathy arched her back as she gently pushed against her brother's cock. The large head slid down again and tucked itself inside her outer pussy lips. Both children gasped and froze in their present position. Cathy's body was shaking from the desire building inside her and not sure if she should move or not. Another shot pumped into Cathy's ass and it was all she could do to keep from screaming into her brother's ear.
Cathy strained to move her ass up let her brother's cock slide along her wet pussy lips another inch, then slowly she moved her pussy back down till it poked at the tube in her ass. Once again she did the same. Each time she moved a little faster. Even as the drug wore off, Cathy continued to move and explore these new feelings stirring insanely inside her. As Cathy's movements continued, the head of her brother's cock parted the lips of her sopping wet pussy a little more with each stroke.
Chris could feel the head of his cock sinking deeper and deeper into the folds of his sister's pussy lips with each movement of her hips. More and more of his cock head was being engulfed as his sister wiggled and slid against him. Suddenly his sister's extremely wet pussy lips parted and the engorged head of Chris' cock slipped between and paused at the entrance to her virgin hole.
'Oh Chris I don't know what's happening to me. I've never even let a boy TOUCH me before. Now I can't stop rubbing my cunt up and down my own brother's cock. I feel so nasty and dirty. I want so badly to be your slut sister,' Cathy moaned as she continued to move her hips in a circle, keeping her brother's cock between her pussy lips and rotating it around the entrance to her cunt hole.
'Chris?' Cathy said in a low moaning voice, 'Do you like having your nasty slut sister do this? Does it feel good to you too?' Chris could only moan an answer to his sexy sister.
As Deb watched and listened to her son and daughter in the next room. She tried desperately to fight the urge to squeeze the device inside her. 'How much longer?' Deb shouted at her brother Jeff.
'It's just getting interesting,' Jeff spoke as he turned to look as his sister's face. 'Look! Your daughter's trying to decide whether to fuck her twin brother's cock. Why don't you give them another dose and help her with the decision?'
Deb stared at her son's cock lodged in the entrance to his sister's cunt. Her children's bodies were covered with sweat and Deb could see the tiny moist beads glistening on the lips of her daughter pussy. She watched as her daughter's pussy lips engulf and circled the huge head of her son's cock. She saw her son's cock jerk with each quiver of his sister cunt. She had to fight the urge to squeeze her cunt muscles, for the sake of her children.
Jeff watched Deb's face fill with determination. He smiled and walked behind her chair. He reached around his sister and gently massaged her breasts and nipples. 'Deb,' he whispered to her. 'Help me show your family the exquisite pleasures of forbidden sex,' he spoke softly, almost lovingly as he gently squeezed both nipples. Then his hands slowly slid down from her breasts towards her shaved mound. 'Help me, Sis, you can do is, let your daughter experience the pleasure of her brother's cock filling and warming her cunt. Your daughter wants it. Just look at her Deb, she wants it so bad. Let her have her brother's sperm.'
Deb screamed as her brother Jeff took her clit and squeezed it hard. Deb could not hold back any longer. She felt so nasty, so good and she wanted her children to feel the same forbidden desires that she was feeling.
Deb's eyes opened wide as she screamed. 'Yeeesss Cathy, fuck your brother. Fuck him – yes – fuck him – fuck his big cock with you tight virgin pussy,' Deb screamed as she struggled in her bonds while her cunt muscles crushed the inflated device inside her. 'Fuck your sister's virgin cunt Chris,' she screamed knowing her son could not hear her. 'Fuck her with that beautiful long cock of yours, Son.'
Jeff watched as the tubes jerked wildly on the floor beneath Deb's chair. He watched the exquisite torture on his sister's face.
Deb continued to watch the scene in the next room while her cunt went crazy with contractions. The tubes delivering the aphrodisiac to her daughter jerked obscenely as dose after dose raced through them towards her daughter ass.
In the next room Cathy screamed as the liquid continued to filled her bowels and leak out around the sides of the tube. Cathy's head snapped up to look into her brother's eyes. Chris watched his sister's expressions turn from innocence to pure lust.
'Oh Chris, I can't hold back any more. I'm yours Chris. I'm your slut,' Cathy spoke to him as she lowered her lips to his and sucked insatiability on his tongue. Cathy arched her back slightly and without warning, forced her cunt
