Yukine X reader

Regalia training?

When I woke up this morning, Hiyori wasn't there. "Oh great," I thought. "I'm left with these two dorks." I paused for a second. "Okay, maybe Yukine isn't as big of a dork." I added on. I got up and walked to the table, Where Kofuku, Daikoku, Yato, and Yukine were sitting. Yato was busy being a weirdo, hugging his bottle of yen, Kofuku was watching him, and Daikoku just sat there silently. Yukine? Well I'm not sure what he's doing. He didn't really notice I was here though.
"Would you like some breakfast?" Daikoku asked. "Yes please." I answered. Soon Daikoku came out with a cup of milk and some bread on a plate. "Thank you." I said. I silently ate my food at the table. "Today, we're gonna teach [name] how to be a regalia!" Yato proclaimed. "Uh..o-okay.." I mumbled. Yukine still hadn't spoken to me. Why hasn't he? Does he not like me? My thoughts were interrupted by Hiyori's voice. "Oh, you're all awake." She said. "Let's go!" Yato exclaimed. Yukine looked at me and mumbled: "Don't scream when you see the phantoms." What are phantoms? My question was soon answered. I screamed. "YATO, WHAT IS THAT?!"
I yelled. "Oh, that's a phantom." He told me. "WELL KILL IT ALREADY!" I screamed. "Ok then. Come, [regalia name]!" He said. My body suddenly became a dagger, and what I was guessing was my spirit was put into this endless white room, with what I thought was shards of glass floating around. "I am so confused..." I whispered to myself. Yato must have heard me, because he said, "Don't be confused, be brave. That will sharpen your blade, making it easier to kill phantoms." In a few quick slashes, Yato had killed the thing. When I was reverted back to my human body, I saw a small grin on Yukine's face. I was smiling too, because, well, I had just killed a phantom on my first try! Or on Yato's first try...I guess. Afterwards, I saw purple-ish spotting on Yato's arm. Worried for my master, reaching out to his arm I asked, "Are you alri--" I was cut off by Yukine grabbing my hand. "Don't touch him. Or you'll get blighted too." He told me. "What is 'blight'?" I asked. "It's like a scar that comes from fighting phantoms, it makes you impure." Yukine explained. "Yukine, while I'm gone purifying this blight, show [name] how to make a borderline, since you're so good at it." Yato said, walking off somewhere.