A/N
To avoid confusion,
"Normal talking"
"Telepathic talking"
Personal thoughts.

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Rin's POV

It was Kuro. He came up to me, nuzzling my leg like a normal cat. I laughed quietly at this, trying to seem nonchalant and carefree. Secretly though, I hoped he'd missed the argument.
"Rin are you okay?" I heard in my head. Kuro had heard.
"Yeah I'm fine Kuro," I try to appear sincere, "don't worry about me."
"Yukio is waiting for you downstairs. He asked me to come get you because he thought that you would just yell at him and call him names before storming off again," Kuro says. Great. Just great. I sigh, conceding to talking a lecture.
"Tell him I'll be down in a few minutes please," I finally reply. I get up and walk to the door. From there, I walk directly to the restroom and pull my sleeve up to inspect the cuts. With a sign of relief, I realize they're healed, which means that I won't face an interrogation of why blood is running down my arm.
I exit the bathroom and walk downstairs to the living room to find Yukio sitting on one of the couches. Obviously, he wanted me to sit next to him. Instead, I sit on a chair opposite him.
"Kuro said you needed something?" I said after a minute of awkward silence.
"Are you depressed again? Is something wrong?" Yukio questions. Depressed...again? I never told him I was depressed before we came to True Cross. How did he find out? I think to myself.
"What do you mean, Yukio? I've never been depressed, so where is this coming from?" I try to appear genuinely confused.
"Don't give me that. I know you've been depressed in the past. I saw your antidepressants in the bathroom cabinet when we were in middle school." He's good. Now I'm worried. I actually did have antidepressants in the bathroom cabinet, and I had started taking them in 6th grade, when Shiro discovered my cutting and depression.
"What are you talking about?" I needed him to lay off.
"You know full well what I'm talking about, Rin." Okay. He's not laying off.
"You try to get out of going to school. You stay quiet and don't do anything. You pretend to sleep. You use every excuse possible to be alone. In fact, didn't you steal a blade from my safe? I know that something's up. Don't try to get out of it. Tell me what's going on. Now," Yukio said. He's harder to fool than I thought.
"Yukio," I say in my most serious and calm voice, "I have no idea what you're talking about. I didn't steal your blade from your safe. Now that this is cleared up, I'm going to bed. See you in the morning." I head upstairs to our room. Once there, I walk to my bed and lay down, pretending to sleep.

Yukio's POV

What? He doesn't know what I'm talking about? That's a lie. I saw the medications with Rin's name on them. I noticed the bandages on his wrists... wait... he must've cut too. Would there be scars on his wrists?
About 10 minutes after Rin went to bed I slipped up the stairs, staying as silent as possible. I opened the the door without making a noise and snuck over to Rin's bed, where I tried to pull his sleeve up to see his wrist. I nearly succeeded, but a hand clamped down on my wrist.
"What do you think you're doing, Yukio?" my brother growls at me. He was asleep... or at least he looked like it.
"Checking to see if there are any scars on your wrists. You being overly protective of your wrists shows that you must've cut before," I bluntly say. Maybe that will push him to show me his wrists.

Rin's POV

Yukio's getting bolder. Luckily, when I came up to our room, I grabbed some concealer and put it on my scars. He won't be able to see them.
"Alright," I pull my sleeves up, "go ahead and check. You're not gonna find any scars because I don't cut and I'm not depressed nor have I ever been." He grabs my left wrist and slowly turns my arm both ways, inspecting it. Once he finishes, he does the same to my right arm.
"Satisfied?" I ask as I pull my sleeves back down.
"Yes. I was wrong, I'm sorry for falsely accusing you," he says before abruptly turning around and going to bed.
I follow suit, waiting for Yukio to fall asleep so I can get up and go to the roof to cut. I need to punish myself for letting Yukio come so close to finding out.
After 2 hours, he's definitely asleep, since I can hear soft snoring coming from his bed. I silently get up and walk out. Using my demon speed, I run up to the roof, knife in hand.
I draw the blade across my bare arm. That's for Yukio finding out one of his blades was missing. I slice my arm again. That's for Yukio noticing how I try to get out of going to school. I cut my arm again and again, once for each mistake I made.
This is for sleeping in class.
This is for Yukio noticing how I try to be alone all the time.
This is for Yukio seeing my antidepressants.
This is for being the son of Satan.
This is for existing.
This is for being born.
This is for causing the old man's death.
This is for scaring my friends. I cut my arm for each friend I've scared, and switch to where I'm cutting my other arm. After an hour, I've cut myself about 100 times, switching arms as they healed. Right now both my arms are covered in cuts. I had started to cut my chest and stomach too. I sit there, blood running down my arms and stomach, dripping onto the cool concrete, watching the sunrise.
It dawns on me to go downstairs for a shower when I hear Yukio coming up the stairs, yelling my name.
"I'm up here Yukio! I'll be down in a minute, I was watching the sunrise!" I yell loud enough for him to hear. He yells "okay" back and heads back downstairs. I follow a couple minutes afterwards, sleeves pulled down over my torn up arms and shirt down over my slashed torso.