Unstoppable (Pinup)

"It... it happened again."

Kelly stood at your door, wearing a sports bra and some very stretchy panties and nothing else.

"Oh my god, Kelly are you okay?" you asked.

"No! It didn't work, I'm still growing!"

"Well, obviously..." you replied. Kelly's face crumpled.

"Oh god I'm sorry Kelly, it's gonna be fine, we'll find something else!"

"Will we?" Kelly replied. "I feel like we've tried everything and no matter what, I still keep getting bigger!"

At a loss for words, you looked at Kelly helplessly.

"God, I wish I'd never built those nano-bots. They've been nothing but trouble since the beginning."

Something stirred in your head. A vague memory. Someone leaving the building the day Kelly tried the nano-bots for the first time.

"Kelly wait."

"What?"

"We've been working under the assumption that the nano-bots are functioning as intended, that the programming you put in place is the only code in their system, right?"

"Of course."

"What if it isn't?"

"What are you saying? Someone tampered with the nano-bots? Who would..." Kelly trailed off.

"Maybe. Maybe someone who knew you were going to test them on yourself?"

"That was only me, you... and Wendy."

Wendy. The figure leaving the building that day certainly could have been her.

"I think we need to go back to the lab, I may have a way to undo what the nano-bots have done, but if Wendy is behind this then she may already-" You stopped as Kelly gave out a sharp gasp.

Kelly's hips and thighs started swelling again. She moaned as her growth caused her entire lower half to jiggle and shake.

Another swell surged her body outwards again and you saw a wet patch form on her panties as Kelly moaned louder. If she hadn't already cum in front of you 3 times as she'd grown before, you would be ashamed and try to look away. But this time you only felt more determined to find a solution.

Kelly was out of breath and twice as big, her legs shaking from an obviously powerful orgasm.

"I'm sorry, I-"

"Don't apologise, this isn't your fault. None of this is." You cut her off. "Wendy obviously knows we know now, we don't have much time."

You grabbed your keys and walked back up to the front door.

"Kelly, get in my truck. We're going back to the lab and we're going to finish this tonight, no matter what."

Kelly nodded and smiled for the first time. She turned around and walked outside, towards your truck.

Watching her ass jiggle and shake with each step she took, you felt your pants grow tight. If you were a worse person, you wouldn't be working so hard to cure Kelly. But maybe, if Wendy had done what you thought she had, there was something else you could do...