With Jenn's body becoming connected to Gia's, the absorption of her body into becoming a monster accelerated rapidly. The tentacle connected to her spine was followed by several more smaller tentacles that turned out to be nerve endings, penetrating Jenn through both the asshole and the spine and settling upon the surface of her now sweaty skin, turning Jenn into the most sensitive part of Gia's body and overloading Jenn's brain with sensations that she never could have been ready to handle, turning her mental capacity to mush.
Gia's vagina began to tighten around Jenn and seal up, until eventually the slit reached Jenn's body. The border between the latex and the flesh became tighter and tighter until eventually it no longer existed. Their bodies had fused. Gia's latex skin began to form a pocket where her vaginal tubes used to be, until Jenn's form was able to extend out of Gia's, stopping before Jenn's legs could emerge.
The extension meant that Jenn's head was slowly pushed into Susan's vagina, which she was very excited about. Jenn's mind was too overloaded to be afraid of this push, so she merely grunted and moaned to express her desire to enter her friend's body, which granted her very easy passage. When Jenn's body finished extending out of Gia's, Jenn could hardly notice in the cacophony of other sensations that her spine was now growing, courtesy of the latex of Gia's skin enveloping her from the point where they had fused.
Gia's spine growing meant that her head was moving forward even more than was previously allowed, until her mouth was shoved between her hands, which were cupped in an O shape at the end of her outstretched, erect arms.
Jenn wiggled her body around inside of Susan, trying to get more pleasure out of the situation, much to Susan's delight. Meanwhile, inside of Gia's body, Jenn's legs became looser, and dangled off of her pelvis. Eventually, Jenn's legs detached from her body, pushing outwards against the region below where Jenn was protruding out of the mass of latex. The taut skin gave way and Jenn's legs fell into a sac beneath her torso. More tendrils inside of Gia entered this sac and poked through the flesh on Jenn's feet, connecting the legs back to Jenn. The legs began to fatten and round out, and suddenly they began to pump tiny cells throughout themselves and the tendrils they were connected to.
Jenn could vividly feel her legs pumping these cells, but she didn't even recognize them as her legs. She managed to moan into Susan's walls "Mmmm, my testicles feel so- so- mmm, FUUUUCKKING GOOOOOOOOOD!"
The flesh of Jenn's shoulders began to rise, connecting her outstretched arms to her elongated neck. Soon, they were completely inseparable, to the point that her arms and hands had melded with her cheeks. That's when Gia had the overwhelming urge to start thrusting.
With one pump, she sent all six feet of Jenn's body deeper into Susan. Susan cried out with enough pleasure to buckle the knees of thirty people as Gia pulled back. Then she thrust again. And again. Susan's mind was now being destroyed in much the same way that Jenn's had already- she could no longer understand anything besides pleasure. Meanwhile, with each thrust, the latex on Jenn's body stretched across her more and more, and it took creative liberties with her body.
Jenn's torso became rounder and more cylindrical. Her generous breasts began to stretch across her chest and fade into her form. Her hair began to recede into her scalp. If Gia had pulled out, Jenn wouldn't be recognizable as a human anymore. All that was left of her was her mouth between her fused fingers- the cylindrical shape had devoured her head, and her latex flesh rolled over her eyes and nose, burying them. Jenn had one final word on the matter: "HARDER!!!"
Gia obeyed this demand, and thrust into Susan with all of her might. Susan became a broken woman, only able to perceive through her vagina. Jenn's mouth extended through the hole in what used to be her hands, and the inside of it filled out. Her tongue fused with her bottom lip and the roof of her mouth became flush with her upper lip, becoming fleshy and wet. Her mouth became vertical, and she was no longer able to open it by willpower, as it didn't have any muscles. Both of her lips were packed together, and still adorned with bright red lipstick. All of Jenn's internal organs melted and reshaped into a single tube, allowing for the passage of a liquid that had been furiously produced inside of Gia's sac.
Gia came inside of Susan. And she didn't just cum. She fucking CAME. The sperm rocketed through her 6 foot cock faster than an actual rocket ship leaving the atmosphere. At this moment, Jenn had also become a broken woman. Jenn could only muster one thought from this moment on: CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM. CUM.
Gia pulled her biblical cock out of her newly minted slave and turned her attention to the stairs, where Kyle stood, his mind unable to process what the fuck he was looking at.