So I edited this chapter and dang were there some embarrassing errors. At least it's fixed now.
The demon in Kaoru's body lurched from the wall, launching himself at Hikaru. "I'm not giving this body back!"
Hikaru acted on instinct and tackled Kaoru's body. "Get out of my brother!" he roared, slamming the spirit hard against the floor with a loud crack.
The demon started laughing hysterically. "Your brother is probably dead by now."
Hikaru roared, anger rising through his chest, making everything turn red. And suddenly he couldn't see anything but he could just feel. He was only feeling the deep seeded hate, so overwhelming. Everything was building and burning and building and burning.
"Hikaru!" a voice called, snapping Hikaru out of his rage.
His vision cleared and he found himself clutching the knife with shaking fingers, holding it against his brother's neck. There was already just a small trickle of blood leaking from where his knife touched the neck. "Fuck!" Hikaru cursed and he immediately backed up, throwing the knife to the floor beside the burning bowl. Kaoru's body was still on the floor laughing uncontrollably.
"Hikaru, we have to do this now!" Kiyoshi yelled.
Hikaru raised his hand and blasted the demon once again with the bright light, throwing him against the wall. The demon growled in rage. "I'm going to kill you!"
"Kaoru is fading!" Kiyoshi hollered, appearing in front of Hikaru, blocking his view of the demon. "He could go at any moment. We have to do this now!"
That snapped Hikaru out of it and he stumbled over to the burning bowl, sitting down onto his knees. "Did you get its name?"
"Kaoru said it's Tatsuya," Kiyoshi said, glancing at Kaoru's body.
"NO!" Tatsuya cried. "You can't do this! NO!"
"Get Kaoru back!" Kiyoshi cried, gesturing to the dying fire. "Quickly!"
Hikaru grabbed the piece of paper from the bed and turned back to the bowl. He had to pronounce each word precisely or who knows what could happen. His hand shook as he raised the paper to the light and began, "Tatsuya!" He looked straight at his brother, seeing the demon behind his eyes. It was terrified. Then he spoke the words, "Exorcizamus te, omnis immundus spiritus…"
He looked up to find Kaoru's, or Tatsuya's, face screwed up in concentration, maybe even pain. "Keep going Hikaru!" Kiyoshi said.
"Omnis satanica potestas, omnis incursio infernalis adversarii!"
That's when the screaming began, loud and excruciating, and Hikaru cringed, imagining his brother in pain and not the demon. Suddenly Kaoru's body lurched forward and Tatsuya ripped himself from the white light Hikaru had blasted at him with.
Hikaru raised his hand to reform the light but Kiyoshi grabbed his hand. "Finish it! I'll take care of him!"
Looking back at the paper, he continued, "Omnis legio," as Tatsuya thrashed in Kaoru's body. Kiyoshi was doing something but he couldn't see what. "Omnis congregation.." Tatsuya screamed louder, thrashing against Kiyoshi hold against his body. And finally, Hikaru yelled, "Et secta diabolica!"
Suddenly Tatsuya fell to the ground, boneless, and then there was just silence. "Is he… Is he gone?" Hikaru asked, looking around.
Kiyoshi looked around slowly while Kaoru dropped the page into the fire, letting it burn. Then he stood and crossed the room to his brother's body. "Will Kaoru just snap back in there or…?"
Dad shrugged. "I don't know."
Hikaru crouched down. Kaoru was pale and completely still. Hikaru couldn't even tell if he was breathing. "Kaoru?" He pressed his fingers to Kaoru's neck, checking for a pulse. Relief washed over him instantly. His heart was pumping steadily and now, watching more closely, he could see the rise and fall of his chest. Hikaru gave a light slap to Kaoru's face. "Come on, Kaoru, you have to snap back now. Get back into your body."
"I'll go see if Kaoru is still downstairs," Dad said before vanishing.
Hikaru sat with his brother, watching and waiting. And he sat with him for less than a minute when Kiyoshi reappeared looking panicked. "Hikaru, you have to get downstairs, right now."
Hikaru flashed down the stairs, scared, terrified. What wasn't his father telling him? What was wrong with Kaoru? Please, please let Kaoru be okay.
He arrived into the living room, panting, glancing around. His father was standing on the other side of the couch, looking down at the floor. Hikaru launched forward, rounded the couch, and halted. He could see Kaoru. He could actually see him again but… it was not a pretty sight.
Kaoru was lying on the ground, eyes closed, perfectly still like his body upstairs. The worst of it all was that Kaoru was flickering in and out of view as if he was just barely hanging on. "What's wrong with him?"
"I don't know," Kiyoshi said, sounding anguished. "We have to do something though. Maybe we should try to bring his spirit to his body."
"Will that work?"
"We have to try," Kiyoshi said forcefully.
Hikaru came closer to Kaoru but did not take his eyes off of Kiyoshi. "What is it? What are you hiding?"
"I'm not—"
"DAD! This is not the time for lies and excuses! Tell me what's wrong with Kaoru."
He sighed. "Listen, you're not going to like it." Hikaru glared. Kiyoshi took a deep breath, reluctant to say his next words. "Fine, Kaoru is fading. I've seen it happen before."
"He is not fading!" Hikaru cried. He leaned down and attempted to touch his brother, but his hand went through Kaoru and his image flickered even more. Hikaru gasped and retracted his hand. "Dad, pick him up," he commanded. He could feel the rising panic. He was feeling lightheaded.
Dad looked devastated but he did what Hikaru said and reached down to pick him up. Just as he tried to touch Kaoru, Kaoru flickered just as rapidly as before. Kiyoshi backed away. "It's too late."
"No it's not!" Hikaru yelled, looking at his brother as he faded from view and reappeared a second later. "No, he's going to be fine. He'll…" He trailed off as Kaoru disappeared again.
But this time Hikaru waited… and waited… and waited…
"Kaoru."
"He's not coming back, Hikaru, not now anyway," Kiyoshi said quietly.
Hikaru stared at the empty space. "No… NO!"