Elysia giggled, knowing exactly what Lupe was seeing. "so you think, but if you keep thinking like that, then won't you stop worrying about what you eat and slowly become rather chubby" She was trying as hard not to come across too mean. That came later in the plan.
[I'm assuming that you don't want us to actually kill her, right?]
"If you're trying to drive me crazy, it's not gonna work." Said Lupe, "I just want to go home. Right now, I don't care about being fat. I just wanna get out of here. And wait, where did that picture come from?!"
''Aha..... if you refuse to eat, you will wither and die.'' The picture mutated to her in a form so tiny she could barely move her veiny limbs. ''And if you eat, you will get fat!'' She changed the mirage again. ''And if you listen to our advice...'' She changed the illusion to show a skinny, loved, beautiful woman. ''You'll end up like this.''
Elysia frowned. She didn't have a medical qualification. She had a murdering/cannibal qualification, but she figured that that wasn't a good thing to mention.
"well... I could explain every detail in complex language, yet I doubt that you would understand it. In basics, it is magic." Eli grinned at her confusion. Emotions tasted sweeter then the flesh its self.
Elysia couldn't help herself. She burst into a fit of giggles, the kind that you might expect a maniac to do. After all, she was a maniac. "lemme tell her Mirai-chan, lemme tell her! Pleeaaasse"