"Do you wanna go out with me?" he asked, his voice trembling from all the pent up anxiety, but his eyes filled with determination.

"No." replied Derek right away, surprise and disdain laced in his angry tone.

Stiles' face went from fragile hope to blatant shock.
Of course, he wasn't exactly expecting a yes - he was Stiles Stilinski after all – spastic kid with a weird skinny gangly body, a hyperactive personality and a prickly attitude – and who would want to date him? Nobody: that really was the right answer – but the disgust wasn't on the list of what he was expecting and it hurt like hell.

Derek and he had been friends for a while; since the second week of the last semester. They had met in their social sciences class, sitting next to each other and being paired for some work, and had immediately hit it off, probably because they were sarcastic soulmates. People who saw them together thought they hated each other and questioned the fact they were hanging out all the time because they were never nice to each other, only snarky and witty and arguing most of the time. But both of them had fun this way. And when nobody was around, when it was just the two of them, everything was different because they were actually close.
Stiles was there to pick Derek up when his high school girlfriend Paige broke up because the long distance thing wasn't working out and she had met someone else. The two guys had sat together in silence for a long time, Derek silently crying and Stiles circling Derek's shoulders with his arm, not saying a thing and just being sad with him.
Later that semester, Stiles got the news that his father, who was Sheriff in his home town, had been shot close to the heart on duty. Derek was with him at the time and he offered right away to drive him to the hospital in the town which was three hours away. Stiles was a sobbing, nervous mess all the way there, unable to stop moving or crying. Usually, Derek would get annoyed and angrily order him to stop. This time he just got along with it, throwing concerned glances his way once in a while and telling him it would be okay once they arrived at the hospital. When they got there, Stiles wouldn't get out of the car because he couldn't bear the thought of seeing his father dead. In the end, his father didn't die, but it was a close call and it took everything out of Stiles to not just drop out of school and come back home to take care of his dad. The only thing that convinced him was when Melissa, his best friend Scott's mother and a nurse, told him she would personally take care of him until Stiles was ready to come back and the assurance that Derek would drive him home every weekend if that could help him be at ease.
That was the kind of friends they were: always edgy on the outside, but ready to be there for the other no matter what happened.
But then Stiles developed feelings for Derek and thought to himself that, even if he got rejected, Derek would never hurt him in any way.
How wrong he had been. Would he have known, never would he have led them to that moment.

"Dude, what the fuck?" Stiles replied quickly. "You know I swing both way, you don't have to sound disgusted about it!" did he say, not managing to keep his voice from going up.

Stiles and Derek's roommate, Isaac, had hooked up not a month ago while Derek was home and they had not been very discreet about it; they even got out of Isaac's room half naked and radiating sex and satisfaction. It had been hardly unnoticeable, really.

Derek stared at Stiles intently with disdain oozing from his piercing green eyes. He took his time choosing his words, as always.
"If you think for a second that I'm letting you anywhere near my dick ever…" he said through his clenched teeth "well you are fucking brain damaged".

Stiles turned his head away to look outside the window of the coffee shop they were at. He didn't want to tear up there and now and he was also trying to dim the feeling of suffocation that was working up his entire body. He was obviously taken aback. The slight disdain, he could have dealt with it. Hell, it wasn't the first time. But this? This mixture of hatred and disgust? That was as unexpected as it heart breaking, especially coming from the guy in front of him.

He put his hands on the table and got up, exhaling deeply.
"Okay then…" he said quietly, not trusting his voice to stay even if it got any louder.

Then, as fast as he could, he took his coat and his backpack and went for the door. As his left hand reached the knob, he heard Derek call him.
Slowly, Stiles looked back at him to acknowledge it, hoping his tears weren't too obvious.

"Your drink is on the counter and I'm not paying for it" Derek told him, his face void of any expression, like it didn't affect him at all anymore what happened to Stiles.

And that's when Stiles broke. His tears were gone faster than they had appeared. He dropped his belongings, not aware of it, stuffed his hands in his pockets while making his way to the counter, took out whatever bills he grabbed first and put it on the counter, not even looking at the barista.
Then he took the drink in his hand and got to Derek in a matter of second and splashed iced cappuccino at his face.
"FUCK YOU" he screamed, attracting every patron's attention in a fraction of a second, as bulky macho I-go-to-the-gym-everyday Derek got up, clearly furious.
Before muscle man could do anything, Stiles followed up with a punch in that perfectly chiseled, infuriating face, square into the nose, busting it and making blood run like the Niagara Falls. To top it off, he put his two hands on Derek's shoulders before he could get back at him and kneed him in the sack so hard he probably couldn't have a family anymore. Finally, he turned around, picked up his stuff and stomped out of the shop, not before shouting "DON'T YOU EVER TALK TO ME AGAIN, ASSHOLE" at the top of his lungs.

He then started to walk toward his dorms. It was a long walk, probably an hour and a half, but he didn't even consider it. He needed to move, to have the feeling he was doing something or he would go nuts. He was fuming almost all the way home, until, suddenly, running out of reasons to be mad, all his rage left him to be replaced by tears and sobs.
He wasn't the one to usually cry after a rejection. But this time he had been so sure. He had been convinced it was mutual. And even if it hadn't been, he had at least been certain that Derek would just brush it off kindly. Say no and then act like they were still the best sarcastic soulmates they could ever be. Now Stiles felt betrayed, alone and heartbroken and he didn't want to exist anymore, so he barged into the room he shared with Scott and hid himself under his covers where he cried to all his heart content until Scott came back from his biology class and tried to talk to him. Then Stiles just started crying harder and Scott got on Stiles bed and laid there with him for a while. Trying to comfort him, not even knowing what was wrong.