down onto her brother's cock. A muffled scream echoed in the chamber between their locked lips.
Cathy's hips gyrated, front to back, side to side while moving up and down on her brother's huge cock. She pulled her lips from her brother's mouth, threw her head back as she screamed with delight. 'Oh God Chris, it feels soooo goood like this! I can't stop fucking. I can feel you all the way inside me, all the way. Fuuuck it feels so good! Am I a good slut Chris? Is your sister a good slut?' Cathy asked her brother as she moved on and off his cock.
'Just don't stop Cathy!' her brother unanswered. 'Don't ever stop, Sis. You're so hot. So tight,' Chris half mumbled and half spoke. Chris suddenly realized that he was on the verge of coming in his sister's pussy. 'Wait! Wait, Sis! Pull off me, quick, pull off now! I'm commmiiinnnggg!!' Chris shouted as his sperm surged through his cock and into his 16-year-old sister's unprotected virgin cunt.
Cathy felt her brother's cock heave, as his hot sperm splashed against the inside walls of her cunt. The sensation of her brother's cock, pulsing as it delivered it's load, and the feeling of his hot sperm packing her stretched cunt, took Cathy over the edge and she came along with her brother.
Deb watched her two oldest children enjoying each others bodies and could not remember why she thought it was a bad thing. She wanted her children to feel pleasure. To love each other. To experience each other.
Jeff turned out the light to the room where the twins were now basking in the afterglow of their first sex. He left the sound on so they could hear if the twins decided to do it again. Jeff had already turned off the machines as soon as Deb had succumbed and her son and daughter had started fucking each other. No need to waist the aphrodisiac when nothing could stop what was going to happen at that point.
Jeff reached down between his sister's thighs and released the pressure of the bulb inside her cunt. It fell to the floor without much noise. Deb's cunt was still gaping open from the stretching it had received and Jeff put two fingers in the entrance to her cunt, barely touching his sister at all.
'You did a good thing, Sis.' Jeff held up the silver dog dick and asked her again.
'Now beg me to put this in your ass little sister. Convince me how much you want it in your ass, and maybe I'll let you lick your son's balls and ass next time you let him fuck his sister.'
Deb knew she could not fight what was happening to her. How could she have come to this, in such a short time. Her thoughts turned her on, the chair turned her on, watching her children turned her on. The realization that she had caused her virgin daughter to fuck her brother really turned her on. Now she was about to beg her brother to put this obscene instrument, where she had never in her life, had anything before.
Deb looked into Jeff's eyes and begged, 'Please Jeff, I want you to shove that big hard dog dick in my burning, needing, ass hole.'
Jeff smiled. 'Beg me more, Sis,' he said.
'I'll do anything. Please – please put it in my ass. I need it soooo badly. I suck your cock. I'll do anything. Pleeeease…' she sobbed. 'I'm so hot for it. Fuck my ass with it Jeff!'
Jeff smiled and placed the tip of the stainless steel monster at the pucker of his sister's ass. He watched her ass pulse in time with the contractions of her cunt muscles. Without warning he rammed it forward. His sister screamed with pain but at the same time pressed her ass hard onto the invading object. Jeff was pleased when he saw that the first three inches were inside. He ignored his sister's screams, leaned back and pushed with all his weight. Screams resounded off the walls as the last of the invading giant disappeared into his sister's ass. Jeff twisted a knob on the base of the connection and the rubber knot expanded inside the stretched ring of her ass. It was secured inside her now and would not come out until Jeff removed it.
Jeff twisted the dial on the pump and a warm liquid started flowing into his sister's bowels. Almost immediately, Deb stopped crying and relaxed. Deb's stomach bulged as the liquid continually filled her intestines. She watched as her stomach continued to expand more and more and waited nervously for the pain to begin. Then the expansion stopped, and Deb looked at her extended stomach, then at her brother.
'The liquid is laced with a pain killer. It will take approximately half an hour for the pain killer to start wearing off. By that time your intestines will have become extremely sore from the pressure there presently under. Your body will quickly start feeling the pain and within a matter of minutes, will become unbearable.'
Jeff closed the shutoff valve at the end of the silver dildo and disconnected the attached hose. 'I must check on your children and husband for now. I'll return in 45 minutes,' he said as the left the room.
CHAPTER TWO
When Jeff returned to the room he could hear Deb screaming through the closed door. Jeff opened the door, walked to the cabinet, grabbed a 2 inch diameter hose and squatted down between his sister's open legs. Jeff ignored the screams and pleas emanating from his desperate and struggling sister.
Deb watched hysterically as her brother connected one end of the hose to the dildo and placed the other end in the drain below the chair. She watched as he opened the valve and felt the pressure dwindle inside her draining intestines.
After 5 minutes, Jeff disconnected the drain hose and reconnected the smaller hose. He walked behind his sister and turned another dial. Again a warm liquid started filling her bowels. The pain subsided slightly and a warm tingling feeling started in her ass. The warm feeling spread through her entire body as she felt herself relax again.
'Feeling good?' her brother asked as he turned the dial to stop the flow.
'Yeess, so relaxed and warm and nice,' she murmured.
'I'm glad, Sis. With your bowels stretched to the maximum, the surface area for absorbing is 4 times larger than normal. Which means that half the normal dose of chemicals will have a greater effect than a full dose would have before. I've added in a small dose of a Spanish Fly mixture I made myself. You should be feeling light, relaxed and very sensual right now.'
Jeff gently placed his hand on his sister's cunt and rubbed her cunt lips in light slow circles.
'Mmmmm that feels goooood Jeff,' she purred as her brother teased her craving pussy. 'Ooooh, don't stop doing that. I neeeeed it soooo badly.'
Jeff stopped his sensual caressing and walked back to the bench. He twisted another dial and turned it off after a few seconds. The response was almost immediate. Deb started rocking her head from side to side and moaning between pants and gasps for breath.
Deb felt a small change in pressure in her bowels and almost immediately there followed a wave of warm chills sweeping her body. Her nipples stood straight out and clit swelled instantly. The lips of her cunt puffed and renewed sex juices flowed from her open pussy. The craving for sex had returned with a vengeance, and now it spread through every part of her body.
'It's time for you to cum Deb and once again I'm going leave the decision to you,' Jeff instructed her.
'I want to cum Jeff, I don't need to decide. I want to cum now, pleeese Jeff!' Deb screamed as the craving kept growing within her body, raising her to greater and greater urgency.
'Then let's see if your ready.' Jeff unhooked the hose between Deb's legs and drained the small amount of liquid in her ass. He next deflated the ring on the dildo and jerked it out in one swift movement. Jeff took the dildo and the hose back to the bench and put them in the sink. From beside the bench the unrolled a garden hose and turned it on.
Jeff sprayed his sister's body to wash off the sweat and filth from the morning training. Deb screamed with delight whenever the stream of water hit her pussy and still open ass hole. When all the dirt, piss and smell was washed down the drain, Jeff recoiled the hose and turned off the water.
Behind her, Deb heard her brother open the door and leave. 'No!' Deb thought. 'He can't leave me like this.'
The door opened again and Jeff walked in front of her with his arm around her 14-year-old son, Bobby. Deb was shocked speechless. Bobby was naked except for a tight leather hood covering his entire head with the exception of his open mouth and lips. Bobby had to keep his mouth open in order to breath while wearing the tight hood. Attached to the leather hood were various rings of stainless steel. Black leather cuffs were buckled around his elbows with the same type of steel loops.
'I've a toy for you to play with,' Jeff announced with a smile.
Jeff directed Bobby to between his mothers naked legs. 'Kneel down,' Jeff commanded the boy.
