As Susan groped and pinched Jens large nipples, four more points along her belly began to become very sensitive. With her friend pumping away on her ass, Jen couldn't really see what was happening, but as the four points began to push forward, Jen began to let the tears flow...her third mutation had come.
The swelling had become a sort of swinging feeling, as four more breasts grew from her fat belly...but if that wasn't bad enough, by the time they grew to match her original tits, she felt two more points...no...four...wait.....six more?! Under her now swinging six breasts, six more points began to swell, turning her front into something more pig-like than even her snout. Her pussy and anus also started to feel strange, as the grew plumper, even around Susan's cock. Jen had been given a porcine set of genitals and dugs.
Somewhere between the tears, the snorts, the squeals, and the moans, Susan was thrusting harder and herder, until she hilted herself into Jen and emptied her giant rat balls. Panting and splaying out on top of her friend, she couldn't utter more than "Jen...I'm sorry...I couldn't...stop...myself."
Even as Susan and Jen quivered and struggled to catch their breath, neither noticed Susan's nails growing longer and sharper, or the fur that had only been around her hips and waist had started to spread. By the time her dick had stopped twitching, and she pulled herself out of her friend, an almost fully Ratified Susan stood in the bathroom behind Jen.
At this point...the damage had been done. All Susan could do, was offer a clawed hand to help Jen up, and to survey the damage.