Grab a knife.

Not even thinking logically enough to call for help, they hobbled to the kitchen to look for something sharp. It took them a minute to stumble over there. Since neither of them had bothered to explore the kitchen yet, they desperately rummaged through drawers as they looked for a suitable implement. After the fourth try, they finally found the cutlery drawer, and produced a wonderfully sharp carving knife! This was going to hurt, but they were much more frightened of how bad this would get if they let this progress.

But it was already too late, as they discovered. Despite their panicked movements, the tugging on their skin had stopped. As they moved, the other girl was pulled along with her with absolutely no wiggle whatsoever.

“Vanessa?” Sasha said with utter terror. “I think our hip bones fused.”

Vanessa said nothing, just let the knife fall from her fingers onto the countertop. It wouldn’t be of any use now. Their hips were much closer together now. They had been sucked in an inch or two. They didn’t even need to pull in order to see the junction between them anymore. Their thighs were now joined all the way down to the knee. And as Sasha put her hand on top of their joined hips, she felt the most disheartening thing she could have imagined. Movement. She could feel their skin slowly drawing tighter between them as the junction between their bodies advanced upward.

They pushed off against each other again, for all the good it would do them. When they came back to their senses, they decided there was no longer any use for anything in the kitchen. They needed to call for help. Maybe one of their phones was working. By now, their legs were joined down to their shins, and they hobbled back to the living room like in a three-legged race. Before they could get to the stairs, they stumbled and fell flat onto the ground.

They flailed for a minute, and finally managed to get themselves sitting on their butts. Once they looked down, they saw why they had fell. Their inner legs were starting to vanish!

By now, the transformation was happening so fast they could see it. Their feet were completely gone, and all what was left was a single stump of a thigh between them, growing shorter and shorter by the second. They kicked and flailed, but didn’t succeed in getting anywhere. Finally, as the last of their inner legs was reabsorbed, their groins began to merge, and it was so far the strangest feeling any of them had ever felt! In wasn’t bad, in fact it felt incredible. It was like rubbing their pussies together, but far more intimate! Far more intense! Not just the outside, but the insides met, literally joining together as one flesh.

They both let out a moan as the merging finished. Just as their inner legs had disappeared, their inside-facing labia were sucked into their merging flesh, and disappeared. All of their organs began to merge, their vaginas, urethras, and clits became one. Finally, their remaining pussy lips drew inward and pressed together, Sasha’s white skin against Vanessa’s light brown. Above the slit, the white/brown junction continued upward, over the top of their fused hips. They still had a full torso each, but below that was only one complete set of legs.

They sat and watched for another minute to see if anything else would happen, but the transformation seemed to have stopped. Was this their new form, or could it start again sometime? They had no idea.

“My god, look at this!” said Vanessa, as she fingered and explored womanhood. They both felt Vanessa’s probing fingers and gasped at once. They looked at each other with the same thought in their minds: they were literally feeling each other’s pleasure! Making love could be interesting like this!

But their moment was interrupted by some commotion upstairs: the sounds of struggling.

“The other girls!” shouted Vanessa. “Are weird things happening to them, too?”

“It’s this house!” replied Sasha. “I know it is! Something is very wrong here! We need to get out of here! Now!”

They began to get up. Strangely, their legs seemed to follow either of their commands. As long as they weren’t fighting each other with opposing commands, they found they were able to use their shared set of legs rather easily.

“And go where? The car hasn’t charged yet, and we’re still naked! No, we have to check on the girls!”