Here's the song, you get a little look into Kostas's past, so that's fun. Enjoy! :)

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Song: I Am Not A Robot by MARINA

(With some slight adjustments to the lyrics to avoid as much repeating and make it more accurate to characters in certain places)

Characters

Kostas, Ometz (older brother), Kyrie (oldest sibling), Quill, and Karma

For some context:

Kyrie basically raised their brothers. Kostas never knew his parents. Luckily, Kyrie was always very loving and supportive, and Kostas always looked to up to them. However, Kyrie was working a lot and wasn't always able to stay home, which wasn't great, especially when Ometz and Kostas got stuck alone together. It was one of these times when Kos, who was only 14 at the time, accidentally let slip that he was being bullied for being emotionless at school, something that Ometz played into very heavily. Kostas, who couldn't control the fact that his emotional experiences were lessened by his power (he still feels emotions, just struggles to show and perceive them, and, yes, they are slightly downplayed compared to normal people), was often called a robot or inhuman, and it started getting to his head, especially when Ometz started to add to it all.

Eventually, Kyrie caught on to what was happening and quickly took action to support her brother and make sure he recognized that his power and the way he felt things didn't make him any less human.

It worked... partially.

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Also, the timeline skips around a little, I'll try to give approximate ages :)

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*Kostas is sitting outside on the porch, smoking a cigarette (a habit he kicked rather quickly) and glaring off into the distance when Kyrie approaches to sit beside him, nudging his side gently*

Kyrie (18), to Kostas (14): "You've been acting awful tough lately. Smoking a lot of cigarettes lately."

Ometz (16), to Kostas (14), mockingly: "But inside, you're just a little baby!"

Kyrie (18), to Kostas (14), comfortingly: "It's okay to say you've got a weak spot, you don't always have to be on top. Better to be hated than loved, loved, loved for what you're not!"

(Switch in the timeline, Kostas confesses to Kyrie that the bullying at school is getting worse)

Kyrie (19), to Kostas (15): "You're vulnerable, you're vulnerable. You are not a robot! You're lovable, so lovable!"

Ometz (17), to Kostas (15): "But you're just troubled!"

Kostas (15), standing up to Ometz (17) for the first time after talking with Kyrie: "Guess what I'm not a robot, a robot!"

(Switch in the timeline, the siblings are younger and, after starting at a new school, Kyrie notices Kostas's new friends are... interesting)

Kyrie (17) to Kostas (13), worriedly: "You've been hanging with the unloved kids, who you never really liked, and you never trusted, but you are so magnetic, you pick up all the pins."

(Another timeline switch, after Kyrie's death)

Quill (15), to Kostas (15): "Never committing to anything."

Karma (14), to Kostas (15), worriedly: "You don't pick up the phone when it ring, ring, rings."

Ometz (17), to Kostas (15): "Don't be so pathetic!"

Quill (15) and Karma (14), to Kostas (15), being the supportive besties they are: "Just open up and sing!"

Kostas (15), confessing his struggles to Quill (15) and Karma (14) for the first time. Desperately: "I'm vulnerable, I'm vulnerable! I am not a robot!"

Quill (15), to Kostas (15): "You're lovable!"

Karma (14), to Kostas (15), following Quill's lead: "So lovable!"

Ometz (17), to Kostas (15): "But you're just troubled!"

(Slight switch in timeline, Kostas is alone in his old room, glaring into a mirror)

Kostas (15): "Guess what I'm not a robot, a robot!"

(Switch in timeline, shortly after Kostas and Karma started dating, Kostas told Karma about all of the bullying and the loss of his sister. Upon finding that he was unable to cry and mourn his sister's death, he panics a little and begs Karma to help)

Kostas (18), to Karma (17): "Can you teach me how to feel real?
Can you turn my power on?"

Karma (17), to Kostas (18), attempting to snap Kos out of it: "Guess what? You are not a robot."

Kostas (18), unconvinced: "I'm not a robot?"

Karma (17), to Kostas (18), encouragingly: "Guess what? You are not a robot!"

Kostas (18), more confident: "I am not a robot!"

(Slight switch in timeline, Kostas calls Ometz to fully cut him out of his life while also proving that his brother did not succeed in breaking him)

Kostas (18), to Ometz (20): "Guess what?! I'm not a robot, a robot!
Guess what, I'm not a robot, a robot!"