Overprotective: AOT/KNB Crossover [Reader x Eren]

Chapter 8: My Sick Days

~from Hanji's POV~
I followed (y/n) down a few streets. Should I seriously start worrying about whether she's lost or not? I mean, I barely even recognize this area, and I live here!
Finally, she stopped outside of an nondescript building and opened the door.
Without hesitating, I waited a minute or two and followed her inside.
I was immediately stopped by the first obstacle: the reception desk.
"How may I help you?" asked a smiling secretary, and I had to wonder if she was paid extra for that.
"Um..." Where even is this place?!
"Do you have an appointment?" she prompted kindly, and I nodded enthusiastically.
"Yeah! Yeah, I have an appointment."
A moment of silence...
"Okay, can I please have your name?" she asked, fingers posed at the keyboard, ready and waiting.
Oh, dang you, level one boss, aka receptionist! You won't beat me! "Well, sorry about that. You see, I'm actually here for a friend of mine."
The secretary's smile loosened just a bit. "Oh?"
"Yeah. I was supposed to accompany here today for...for, you know, the appointment, obviously...but she said to meet up here. Has she already stopped by?" Of course she did; I watched her come in.
The secretary gave me a professional smile. "I'm sorry, but I'm not at liberty to release private patients' information."
Oh, you're a tough one! I grinned, excited by the challenge. "I understand. Next time, I'll be sure to come in with her. Thanks for your help!" Regrettably, I had forced myself into a corner and had to exit the building. But I will return again, for sure!
Only later did I wonder about the receptionist's words - patients' information.
***
(Y/n) showed up at school the next day, looking a little pale, but when I pointed it out, she started shaking and mentioned seeing a huge dog on the way to school.
I felt bad for spying on (y/n), but I felt worse because I couldn't tell if she was lying to me. She'd never seemed anything but honest, and to be fair, I had no proof that she was otherwise, but something was poking at me to learn more about her.
In the middle of my investigation, I decided to say nothing as to alert her to my knowledge. Instead, I'd do some sleuthing myself, find something hard that I could bring to her - or, better yet, disprove whatever strange feeling had been haunting me.
***
I decided to cut to the one source who might actually know something. My only source, really.
"Hey, Levi," I said. We were in my apartment, him sitting in an armchair and scowling while I hung upside down from the couch.
"Why did you drag me here, brat?" he asked, glaring at my furniture.
It's not my fault that you have no sense of style. "It's about (y/n)."
"You said that already," he snapped. "And I repeat: why did you drag me here?"
I blinked at him through my glasses. "Well, duh, idiot. You're her brother."
He turned his glare from my multicolored owl lamp (one of a kind, collector's edition, I'll have you know) to me instead. "What's that supposed to mean?"
I groaned. "C'mon, Levi. You've got to know something."
"Why are you even looking into (y/n)?" he asked, frowning and pulling off a lovely angry + confused face. "Aren't you her friend or whatever?"
I stuck out my tongue at him. "Yeah, I am. So what?"
He clenched his jaw, one straw away from strangling me and leaving the landlord to find the body. "GET TO THE POINT, HANJI."
I rolled my eyes. "Sheesh, Levi. I was getting there." I exhaled before looking at him again. "What does (y/n) do on the days that she stays home?"
He just looked at me. "I'm in school, brat. How would I know?"
"Good point, good point," I murmured, nodding. "All right. You present a solid argument, so I won't press charges."
"WHAT?"
"And another thing. Did (y/n) have a check-up or a doctor's appointment or something this week?"
"Again, Hanji, how the hell would I know? What do I look like, her personal calendar?" he snapped before standing up and leaving, making sure to kindly slam the door behind him.
"Hmmm..." I mused to myself, finally righting my position and letting my blood circulation return to normal as I sat cross-legged on the couch, hand propping up my chin in deep thought. "What is (y/n) hiding?"