It's in Lavi's point of view.
Note: In this story on my Lunaescence account, the character is a reader instead of OC due to Fanfiction's rules saying no reader-interactive stories. Also, I'm going to attempt to make them longer as adviced by Aki-chan, but no guarantees. The chapters are short because they're drabbles/ficlets, but I'll try.
As for the name, I was originally not going to give her one for certain reasons but I will now. She is Polish exorcist named Kasia Kwiatkowska (Ka-shi-uh Quee-at-cow-ska), age 18.
"Hey Kasia, it's Lavi. May I come in?" I asked, lightly rapping my knuckles against her door. I caught the soft noise of approval hidden among the muffled sniffles that could be heard from the other side of the door.
Making my way into her room, I saw her small form curled up and buried underneath the sheets of her bed. "Come on Kasia! Up you go!" I yanked off the bed sheets, causing her to roll off the bed. "It's only 1 o'clock. Now's not time to be sleeping. How 'bout you get up and we'll go out for a walk or something. It's a great day! The sun's shining; the birds are singing; and all that other good stuff is happening too. Come on, come on!" No reaction.
I walked to the side of the bed Kasia fell to and saw that she was still curled up and not listening to a thing I said. With a sigh, I kneeled down beside her and helped her to her feet.
"Kasia, you can't keep yourself locked in here forever. Especially over something as miniscule as this," I said, brushing her messy, dark blonde hair out of her face, revealing her tear-stained face and closed eyes.
Still not getting any reaction from her, I leaned my face close to hers and closed my visible eye. I took a small breath and opened my eye again before gently pressing my lips against hers.
That definitely got a reaction out of her. Her gray-blue eyes snapped open wide, looking into mine with surprise. I pulled away slightly then pressed my forehead to hers. "Actually, how about we go to a café at a town not too far from here, hmm? What do you say?"
She was still a bit out of it, but nodded her head nonetheless. "Yay! Come on!" I cheered, practically dragging her out of her room. I saw a small smile work its way on her face as we ran.
Just as we were about the leave the headquarters (with Komui's permission, of course), I noticed Kanda peering down at us from the stairs. I briefly checked to make sure Kasia wasn't looking before I glanced back at Kanda, sending him a mocking smirk. The corners of his perpetual scowl seemed to twitch down a little more, if possible, as I continued pulling my blushing date.