Tiff's exclamation, though only faintly heard, was enough to direct Katie's attention to her crotch, which she had to have been rubbing raw.
Katie was shocked when she saw herself. Her pussy was stretching horizontally, as if made of bubblegum. The harder she ground her hands, the wider her hole grew. Her labia spread further and further apart, and her clit was straining to stay together - Katie was sure that it would split down the middle if she didn't stop.
Then, it did.
Both girls stared at Katie's vagina as her clit snapped in two, pulling apart under the girl's frantic assault. Soon, each clit was forming its own cleft, and Katie's urethra was torn into two as well. Slowly but surely, the raven-haired girl's stretching pussy formed a dividing wall in its middle, separating the oversized orifice into a pair of smaller ones. Labia sprouted from above and below the wall and grew onto it, growing outward toward the outer lips that would be their counterparts.
The burning in Katie's nether regions finally ceased, and the poor girl collapsed on her back, exhausted, her hands slipping onto her stomach. Tess, presented with her friend's nude and newly reformed crotch, moved in for a close inspection. She sniffed. "Katie."
Katie didn't even move her head to look at the brunette. "What... is it? ...What happened?"
"Katie, you... You've got two pussies now."
Tess drew closer to the orifices, as though entranced. Katie could feel her friend's warm breath on her aching openings and shuddered from the sensation. It was pleasant if not arousing, but arousing wasn't something she needed while she was still raw. If Tess would do this later, though - wait, was Katie still thinking like that about her?
A noise got Katie's attention. When she opened her eyes, looking down her body, she saw...