"The two shall be side by side".

"Here. Take a look at this one." Caroline said as she looked at the book. "'The two people shall be side by side and bound together by their flesh and skin to be one and the same." Caroline says, trying to pronounce things correctly. "So...."
"Our sides would be stuck together?" Jane asks. "How stuck?"
"Doesn't say."
"Wanna go for it?"
"Well, it seems more tame than a lot of the other stuff I saw in here... Sure..." Caroline says, a little unsure. Jane walks up to Caroline's right side and looked through the book.
"Ku... Kunigloo... Neajn flank... Flankogn pork ae ni...." Jane tries to read.
"Oh, let me see that." Caroline says as she takes the book back. Jane hums in frustration, but she doesn't argue much, instead leaning on Caroline's shoulder.
"Kunigu niajn flankojn por ke ni estu unu en korpo kaj koro..." Caroline says. Whether she said it right is anyone's guess. Of course, the feeling that was flaring up in their sides seemed to be a good indication that it was working.
"Oooo... You feel that?" Jane asked.
"You mean the feeling of being sunburnt, but not? Yeah, I can feel that." Caroline replies.
"Maybe we should get..." Jane started as she tried to reach for her phone. But when she tried to step away from Caroline, Caroline got pulled along with her.
"Ah! What the...?" Caroline asked as she pulled back, yanking Jane with her.
"Hey!" Jane said. The two of them try and get a solid footing before pulling in opposite directions. Their skin pulls, but it doesn't come apart.
"Oh my God! We're actually stuck!" Caroline shouts.
"I know!" Jane says as they calm down and try to figure it out. Once their legs lined up, they became stuck as well, leaving the two of them in a three legged race situation. That position of course soon became a lot more apt as they felt their legs start to melt into each other, working like a zipper up their bodies.
"Oh, God!" Caroline said as the two of them felt this **** pulling them together so tight that they melted into one another. As it reached their chest, Caroline's breast absorbed Jane's like two bubbles becoming one. Their arms melted into each other's sides, soon losing feeling all together. With one last pull, the girls tried to stop it, but they couldn't. They were left as two overlapping girls with three legs, two vaginas, two belly buttons, three breasts, two arms and two heads between them.

"Oh my god... Jane, what the fuck happened to us?..." Caroline asked.
"We're stuck!" Jane says. The two of them looked themselves up and down their body as they tried to comprehend this. Eventually, they find themselves looking at each other before making one last attempt to pull in separate directions. "Yup... We're stuck..."
"Great... Now what do we do?..." Caroline asked. The two of them look at the book again.
"What do you want to do?..."