What looks like a remote, and what looks like a stamp

I look at the desk and notice that there was a remote with a screen, and at the bottom of the screen is a knob, with indicators labelled 'S' and 'G', along with a button that says 'R'. The screen is currently black, and as you get a closer look at the stamp beside it, Ms. Hendrickson notices your presence.

"Ah Davey! Perfect timing, these girls worked on this device in engineering, and they were looking for someone to test it on." Ms. Hendrickson said. Naomie briefly turned around and gave me a smile, and i responded.

"What does it do?"

"Oh, it's supposed to be a new method of weight loss using nano-tech. These girls have tested on live subjects before, they just need human testers."

"So you can assure my safety?"

"Yes, and if anything goes wrong they can easily shut it down."

I ended up agreeing, and the 3 ladies sat me down in a chair, where they stamped my arm with the stamp, i didn't seem to leave a mark, but when they stamped me it felt like I was getting a really small shot.

"Okay, your all set! I have to teach class, so I'll leave you to these two girls, and I'll cover your attendance." Ms. Hendrickson said, exiting the classroom.

"Okay Davey, you might feel a bit of pressure when I do this, so be prepared" Naomie said, turning a knob.

I then felt a feeling i have never experienced, first it felt like gravity was multiplied, like I was in a elevator going upwards, then I felt a sensation like I was being pulled from the inside of my body, or like if the air became more dense, pushing me in from all directions.

"Oh my god it worked!" The girl next to Naomie said in shock, writing in her notepad.

I then saw what she was talking about, while normally I had a few inches on Naomie, now I only came up to her chest.

"What the fuck!" I yelled in confusion, "I thought you said this thing was for weight loss!"

"Calm down Davey," Naomie cooed, "It is for weight loss, it just takes away weight proportionally, so you also get a bit smaller."

"But if we are being honest," the other girl chimed in, "We are trying to inject these nanobots into all the male students at school, and give the remotes to all the females to use as a disciplinary device. Not that you have to worry, I doubt you'll be any trouble." Naomie pats my head as the other girl says this.