The shower was now completely filled with purple steam. Justin continued ramming his dick into Laura's wet slit. Neither noticed the tails that had sprung from their backsides. Small, curled pig tails that hung over their growing asses.
Justin's grunts became deeper, and finally he bellowed as he came. They both were in a bit of shock from cumming, and let the water run over their bodies. But something felt off. Justin idly scratched his chest, unaware that his skin was thicker, and hairier.
Laura's breasts felt heavier on her chest, but in reality she just had more of them. Below her original pair, there were three more rows growing. Long nipples hung from her torso, lumps of flesh bulging behind them. Justin's hands went around Laura to pull her closer to him. Though his hands touched the bottom row of Laura's new breasts, his mind didn't seem to register that something was wrong.
A sudden surge went through Justin's body, telling him to again take his female. His cock pounded as he snorted in more and more of the infected air. His nose swelled, and pushed up away from his face. His upper lip gained mass, and eventually merged with his growing nose. Justin squealed a very piggish squeal once his new snout finished forming. Two long tusks cradled either sides of his new pig face.
That's when Laura snapped out of her trance. She turned around and screamed when she saw Justin. Aside from the pig snout on his face, he was enormous. His body had gained a substantial amount of mass. His stomach bulged out, and Justin had man boobs hanging on his chest. What's more, his entire body seemed to be covered in long, dark hairs.
"What the fuck is happening?!" Laura cried out, trying to get as far away from Justin as possible. Which was difficult seeing as they were in the shower together. Justin snorted, his mind slowly regressing. At the moment the only thing on his mind was mating with the female in front of him. She smelled ready, and her pussy was dripping (and not just from the shower). Justin knew she wanted him, and he continued to move closer.
Laura shut off the water, but the whole room was still filled with that purple steam. She jumped out of the shower and fled towards the bedroom. Justin, now fatter and more piggish, had a hard time following. His legs were changing, becoming shorter and fatter. In addition to his feet becoming hooves.
Laura locked the bedroom door behind her, and them screamed again as she saw that she too was transforming into a pig creature. Her eight breasts were each DD cup, and had long, dark colored nipples in the center. As Laura stared, her chest began to get hairier, just like Justin's was. Similar brown hairs poked through her thickening skin, until it looked like she had a happy trail going from her naval between her rows of breasts and to her collarbone.