Darko

It was a day like any other. You woke up early, got ready, grabbed your backpack, and left home to catch the bus to university. At the bus stop, you ran into Kael, your neighbor and childhood friend. You arrived at the university together, and he said goodbye. You went to your classroom and checked your phone while you waited for class to start.
The teacher had been lecturing for a while when the classroom door opened: it was Darko, late as usual. The teacher didn't bother to scold him; he was used to Darko interrupting his class every morning. He was a troublemaker, always smoking and seemingly not even interested in studying, but the teachers had asked you to help him with his studies, and you agreed, so he started sitting next to you in class.
Darko walked to the back of the classroom, his silver chain gleaming in the sunlight filtering through the window. He wore his black leather jacket, the one he almost always wore. He glanced at his usual seat next to you, took a breath as he pulled out the chair, and plopped down without even looking at you.
"Good morning," you said softly. He barely glanced at you and didn't respond. You'd been sitting together for almost two weeks, but he'd hardly exchanged a word or two with you; he was very grumpy and didn't talk to anyone. He did what he did every morning: take out his notebook, which was empty, settle down at his desk, and sleep through the rest of the class. You watched him sleep, and in a last desperate attempt to get along with him, even just once, you started taking notes in his notebook for the exam.
When the class ended, you left his notebook as it was, put your things away, nudged his shoulder with one hand to wake him up as he had asked you to do since the first day, and left the classroom towards your locker, waiting to see what his reaction would be when he saw the notes.