Rub-in nanobot tittie cream

"That stuff in the spa looked really cool," Matt said.

"The cream with the nanobots in it?" Harold asked

"Molly deserves the hands-on treatment after leaving her alone for the start of the party," Matt reasoned.

"Well aren't you the solicitous boyfriend!" Harold said.

Molly didn't care as long as the end result was big fake titties, so she let herself be led to Harold's spa room.

There were a few people there already. A red-headed woman a decade or so older than Molly had big fake titties and she was rubbing something all over them.

"Bigger! They're still getting bigger!" The woman was mumbling drunkenly.

In the shower, a man was rubbing stuff into a tiny Asian woman who was giggling uncontrollably as her titties grew before their very eyes.

"I want that!" Molly declared without hesitation.

"And you'll get that, Molly dear," Harold said. "But not with your clothes on!"

Molly didn't have to be told twice. The women in the spa without their clothes on were getting big fake titties. She couldn't strip fast enough!

"I want big fake titties!" She told Harold and Matt. "And then I want to fuck!"

"Do I just rub it in?" Matt asked, picking up a tub of goo. "Is it safe on my hands?"

"Definitely!" Harold assured him. "The nanobots in the cream recognize breast tissue and amplify it. They fortify the skin on top to prevent stretch marks but ignore all other tissue."

"Well ok then!" Matt said and grabbed a dollop and started smearing it on Molly's intolerably flat chest.

It tingled and warmed and Molly sighed. Was this it at last? Would she finally get the titties she needed more than anything?

"The nanobots are kinetically regulated," Harold said, stepping up behind Molly and cupping her with his hands. "The more vigorously you rub them in, the more they'll expand her titties. So if you want her really big, you need to really work it. Like this."

Her boyfriend's boss began massaging her tits, a deep tissue massage that ached exquisitely. Molly moaned. Her breasts burned.

And they started to grow.

"Oh yes...oh yes!" Molly exclaimed.

"That's a good girl Molly," Harold whispered. "That's a good little bimboslut. Grow those titties. Grow them nice and big for us."

"Big...big fake...big fake TITTIES!" Molly exclaimed and shuddered, her eyes rolling back in her head.

"Take over, Matt," Harold said. "My hands are getting tired and you know how big you want them. Just stop rubbing when you think she's big enough and the bots will go dormant."

Molly blinked her eyes back into focus to see her boyfriend was groping her from in front now. Titflesh was expanding with every squeeze and his hands could barely cover her boobs.

"You're giving me big fake titties, Matt!" She exclaimed.

"I am, Molly!" He agreed.

"You're such a good boyfriend!" She exclaimed. "Don't stop! Don't stop! I want to be bigger! I want to be so much bigger! The bigger you make my titties, the more I'll fuck your brains out!"