Invader Zim ZADR: Chains And Bite Marks (Ch. 1)

I walked out of the elevator to find myself in Zim’s attic. I groaned, “ Zim, what am I doing here?”
Zim seemed to ignore my question, and instead walked passed me, to a book shelf. He picked out a book, and opened it, apparently scanning the contents.
He began to hum lightly as he looked tough the pages. I rolled my eyes, and sat on the floor, that’s when I noticed the pain. I hissed a bit, and looked down at my torso. It was covered in bite marks, and scratches. .
Dib whimpered, “Z-Zim?”
“What do you want? Stupid big-headed-fool-boy-creature. . .” Zim sighed, as he continued with his reading.
“Where did these bites marks come from?” I asked worriedly, hoping Zim would bother answering.
“From me. . .” Zim said frown on his face, yet never looking up from his book.
“How about the scratches?” I asked, surprised.
“Zim did that to.” Zim answered, still never looking up from his book.
I frowned deeply, why did he bite me? What did he do to me in those hours?
“Why?” I asked.
“Why what?” Zim now looked up from his book, lekku pressed back agents his head.
“Why in the Hell, would you bite me!” I exclaimed angrily.
“Because Dib-stink, you told me to.” Zim growled.
“No I didn’t! I don’t remember ever giving you the permission to do this!” I growled back.
“You lie!” Zim screamed at me, then he looked back down to his book.
I sighed and examined my body further. There was something that caught my eye, on the back of my shoulder, but I couldn’t quiet see it. . .
“Zim? Do you have a mirror around here?” I asked Zim.
“In there, return quickly.” Zim pointed to a door, and I nodded.
I stood from my place in the floor, and walked into the room. It was like any other bathroom I had ever seen, except for the over sized bathtub, big enough for at least four to five people.
I walked over to the mirror, and turned to see my back. What I saw shocked me. . .
It was a tattoo, of the Irken symbol.