Operation: Incentive - Invader Zim fanfic (ZADF)

Cover Ups.

Dib walked out of the toilets half an hour later, with toilet paper wrapped around the "infected" eye. He had been passed out for nearly two hours; lunch started a few minutes ago.

He strode into the dining room, and after a quick scan, spotted Zim sitting behind his usual spot. He did a little half walk, half run up to him, and said in a scarily calm voice, "Zim. What did you do? What did you do to me, Zim?" 
Zim looked him up and down before replying, "You are looking a little peaky today, Dib-Stink. Is your health ok?" He stood up and walked away, smirking to himself.

Dib cursed. That filthy alien! He knows exactly what he's done, he thought to himself. He sat down in his usual spot, and decided not to have a school lunch today. He may be feeling a little better, but he still didn't trust himself not to spew it all up again. He saw Gaz walk in, absorbed in a game. Not looking up from the controller, she walked towards Dib.
Dib panicked a little; should he tell her? He decided not to as she sat down beside him. She dropped his school bag: she must have got it from the classroom for him!
"Hi." she said.
"Hello."
When Dib fell silent, she looked up from the Game Slave.
"No plots today?" She asked.
"What do you mean, no plots?" Dib replied blankly.
"Normally, we both sit together with a huge meal, we greet each other and you go on a tirade about Zim while I ignore you."
Wow, Dib thought. What a great vote of confidence from my dear sister. Gaz didn't elaborate, so Dib said, "I...just don't have any plots, that's all."
Gaz let out a sigh of disbelief.
"Sure you don't," she said, "but if you need something, I'm here." And with that, she stood up and walked away.

Dib unzipped his bag, and retrieved his notebook. He popped in the code and started looking through, maybe to give him some idea of what was happening to him, or maybe just to distract him or to give him something to do.

He realized he needed a plan. And Dib's plans were always great.

By the end of the lunch break, he had a full plan of action lined out. He had some suspicions of what was happening... But he needed confirmation.

On the way out of the lunch hall, he accidentally-on-purpose bumped into Zita, whose new sunglasses fell out of her bag. He swiftly retrieved them and headed to the toilet. Contacts would have to be ordered, but he could improvise with some sunglasses for now. He'd make a pair of gloves during the last lesson of the day. He knew what he had to do, and he'd learned from the master.

He'd have to pull a Zim.