Escalation.

"You should definitely remove mine, but it's a good idea to keep yours on," Trevor blurted quickly. Casey nodded and peeled the sticker off of him, then looked at it curiously.

"Do you mind telling me why?" she asked innocently. There was absolutely no suspicion in her tone; she sounded genuinely curious.

"It's better to test it on you than me," he said tentatively. Casey nodded, completely satisfied.

"Of course," she said. "Only one of us at a time, and since it's my device, we might as well test it on me. I wonder if it can change my physical attributes?"

Before he could respond, Casey grabbed it from him and pressed the button. "Six feet tall," she said into the microphone, and slapped the disc it spit out onto her forearm. Trevor's eyes widened as she instantly became quite a bit taller. She put an arm out to steady herself, wobbling on her feet.

"Whoa!" she cried out. "Holy shit, I just got taller! This is- oh my God, I'm gonna be sick."

"Close your eyes!" Trevor said, and put an arm on her shoulder to steady her. Even he had mild vertigo as he reached up to touch his formerly 5'2" roommate. She did as he said and her posture straightened, although she still looked panicky and distressed.

"Can you take it off for me?" she pleaded. "It feels really weird... I don't like it."

Trevor scratched fruitlessly at the words on her arm. "I think you have to," he said. She nodded and reached a shaking hand down to her arm, effortlessly peeling it off of herself. She reverted instantly, breathed a sigh of relief, and opened her eyes.

"Wow, that was a lot. I think we should be more careful with this thing..."

"You should definitely be more careful," Trevor said suddenly. "You shouldn't use it at all, actually. I don't need to be careful, since I'm doing the experiments."

"Of course," she said simply. "That makes sense. Hey, I've got an idea... since we made me stupid earlier, do you think we could make me really smart?"

Trevor shrugged. "Worth a shot." He pressed the button and said "Extremely intelligent," then put the sticker next to the other on her arm. She stared at it, eyes wide, then looked at him. Her eyes searched his for a second before she spoke.

"You're manipulating me," she said flatly. Trevor panicked and opened his mouth, but she put a hand over it quickly. "Don't tell me you're not. It's ok, I'm not going to try to stop you."

"...you're not?" he asked when she removed her hand. "Why not?"

"Why would I?" she asked him. "You've got complete control over me. Besides, I know we should experiment on me. I know I shouldn't use the device. I'm aware that I only know those things because you said them, but that doesn't make them untrue."

"What are you talking about?"

She sighed. "Trevor, I know that the sky is blue. If you tell me the sky is blue, I'll be aware that the foundation of my knowledge is no longer personal experience but your words. That doesn't mean the sky isn't blue. It just means my reasoning changed. It's like taking a different route to the same destination."

Trevor stared at her for a second, then reached out and peeled the "extremely intelligent" disc off of her arm. "That's enough of that," he said as he tossed it aside. "Now, I believe you owe me a blowjob."

Casey shook her head, mentally reeling from the drastic reduction in her cognitive ability. "I... that's right, I do."

"One thing first, though." Trevor slapped a disc onto her arm. She looked down and grinned at the three words already melding into her flesh: "GIVES GREAT HEAD".