NOTE: For those of you who've seen this on Wandering Soul's "Anime/VG Inflation Uber-Story", I'll explain. I decided to copy the starting chapter to this story as WSoul prefers to have body inflation in his stories. This way the storyline can be a little more "freeform" so to speak. If you made a chapter in the original storyline, you can add it or make a new version.

Roll made sure she finished the housework early. Dr. Light and Megaman left early to
go attend a two week conference on advancements in robotic energy systems, and
Dr. Light wanted to showcase his prototype micro-fusion generator. But having a tidy
home for them to come home to wasn't Roll's motivation. Not by a long shot. She was tidying up some of Dr. Light's notes when she came across some of his notes from when he upgraded Megaman when Dr. Wily first tried to conquer the world. According to them, Dr. Light was planning to install an emergency floatation system into some of his robots. But due to his upgrade, Megaman couldn't use the system.
Roll had both a certain interest and a curiosity for inflation, so naturally, she wouldn't let this chance go to waste. It took a little effort for Roll to hide her purchases, but she was able to make and install a floatation system, and even a few improvements. All she was missing was an internal gas cartridge.

But Roll had a solution.

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"Let's see." Roll said. "I installed the little plug-in where I would have a navel, and
enough helium tanks to last me for the whole two weeks."

Roll attached one end of a long hose into a tank, and plugged the other end into her
own nozzle. Before she turned opened the valve on the tank, Roll wondered how she should make her first inflation.

'Should I just fill out my whole body, or try for a more "mature" hourglass look?'