As the combined body of Jen, Claire, Lucy and Martha moved over to the combined body of all four of the girls parents, Jen and Claire realized that they were once again stuck as a passenger on someone else's body This time it was their maid Martha, who had complete control over the body except for the six foot dicks that were controlled by the girl who's head replaced the tip. The girls didn't have much time to contemplate their position at the moment though, as Martha now stood in front of their parents. The two girls wondered how exactly they were going to have sex with the twenty foot tall dragon/centaur hybrid that their parents had turned into, as their massive horsecock alone was nearly as big as Martha's entire body.
The question was soon answered when Martha climbed atop their parents horizontal pillar of horse-meat, before turning around, wrapping her legs around it and beginning to stroke it. Meanwhile Martha moved her upper body over in front of the head of the horsecock and thrust Lucy's cock head into the urethra-mouth of Jen's father. Once the other two members of their body had begun pleasuring their parent horsecock, Jen and Claire began looking for something they could do, finding that with their long cock-bodies they could reach the back of their parent centaur body. The two girls wasted no time diving into their parents horse pussy. coiling around each other ass they pistoned in and out. Meanwhile up atop the dragoness body of their parents, the three heads were taking turns kissing one another, with the remaining one sucking on their tail-cock, while they grope their quad breasts. Martha was the first to cum, her face-cock spraying cum over the top of the horsecock she's riding. Next was Lucy, Jen's father expertly sucking the cum into her balls. Jen and Claire then blasted their twin loads deep into their parents horse pussy, some of it overflowing onto the floor. Finally, the girls parents all came simultaneously, Jen's father erupting with a flood of cum that forced Lucy's knot out of her urethra-mouth as several dozen litres of jizz paint almost the entire kitchen white, while their tail cock fills their upper stomach to the point where it starts to bulge.
The eight lovers remain where they are for a while, recovering from their escapades.
“Whew Martha, you always know how to get us to blow” The centre dragon head, Claire's original father says, patting their cum-filled belly. Martha typed something on her tablet, and a feminine text-to-speech voice read her message out loud
“Well I have to give some credit to Lucy and your daughters, without them I would never be able to keep up with you monstrous libido”
“Of course, our wonderful girls make amazing cocks, were very proud of them.” The left dragon head, Claire's original mother, proclaimed.
“Well, they are the daughters of the best cock in the business” Boasted the cock head that was originally Jen's father.
“Yes they do take after you a lot don't they” Replied the right dragon head, originally Jen's mother.
Now that the families after dinner sex was over, Martha resumed her maid duties, giving the two girls a good opportunity to take in the changes to their house that had come with the new reality the pills created. The first thing they noticed was that every surface of the house was now made out of a liquid resistant material, and all of the electronics were waterproofed, preventing any major damage from careless ejaculations. The houses size once again readjusted, now designed to comfortable fit the twenty foot tall body of their parents, with several accommodations allowing Martha to reach anything she might need. Their were only two bedroom, Martha's and their parent's, each with a bathroom designed for the rooms occupant. Finally, new room had appeared, and from what the girls could glean it was a milking room for their parents. Apparently their conjoined parents sperm were hyper-virile and long lived, making them a desired commodity for people and couples who wanted to have kids but had low natural fertility. Additionally their sperm was able to impregnate any animal, meaning it was incredibly valuable in breeding endangered species, as well as for breeders who wanted animals with excellent genes. They made enough money to live comfortably off of selling their sperm, so they didn't need any other job.
Once Martha finished her cleaning rounds, she went to her room and spread her body out on her giant bed, her and her three body-mates falling asleep for the night. The two girls dreaming of what they would do with their pills now that they could spit them out at will.
The next morning the four body-mates woke up early so Martha could do her morning rounds and make breakfast. While Martha was cleaning the milking room, Jen and Claire noticed several filled tanks of their parents cum, ready to be shipped off around the world. Claire had a devious idea that she whispered to Jen, before both girls moved their cock-bodies over to the tanks and, making sure Martha didn't notice, began dropping dozens of pills into each one, ensuring anyone who made use of the sperm would be affected by the pills and transform. Once all of the tanks were infected, the girls went back to helping Martha with her duties.
Once the family had finished eating breakfast, and having another quick fuck afterwards, it was time for the days activities. Since Martha, Claire, Jen and, Lucy all shared a body, the girls wondered if they would have to just go along with Martha like they did when they were Lucy's cocks, or if they would have some say in what they do.