Write some more on her

As Alex looked on at his flatmate eating in front of him he quickly thought about all the possibilities he could unlock with these newfound powers and figured he needed a bit more testing.

"Hey, can I get my arm for a sec?" he asked.

"Sure" Stella said holding it out to him and going back to browsing her phone.

"I know I can own someone's body parts, but what about someone's abstract parts?" he thought

As his sharpie touched her skin Stella didn't flinch as he quickly wrote down "Alex's sense of taste" on her arm before clearing his throat to get her attention.

Stella uninterestedly looked up, before letting her gaze fall on "his" arm and stopping for a second, "I don't know how to stop tasting things, Alex. So I'll have to ask you if I can keep using your sense of taste" she asked pleading at him with her eyes.

"Sure" he said, "In fact everything you eat will taste delicious, no matter what it is" he added as he watched Stella's eyes open with delight as she went back to eating her rice with gusto, now smiling.

"Ok, this works. What about beliefs" he thought looking down at the arm still in front of him.

He quickly leaned forward and scribbled "Alex's political beliefs" on her arm, before pointing at it gathering his flatmate's attention on it.

Before she could open her mouth he simply said "You're a republican now", knowing his flatmate was a proud liberal like him and would rather die than vote red.

Nothing changed in her demeanor, but a quick check on her twitter page showed him she'd just retweeted some Alt-Right post about abortions, so he felt his point was made.

"You're actually a liberal now" he said quickly watching her face turn to confusion before she deleted her retweet.

"So it works on pretty much anything as long as I specify it" he thought thinking on his next step.