Stiles is happy that they won the game, but he kind of feels bad about Cora. So he leaves the locker room celebrations early and heads to the hospital wing. Melissa greets him at the door, rolling her eyes.
"I wish you kids would be a bit more careful out of the pitch," she complains as she points out Cora's bed. "The rest of the Gryffindor team just left. Oh, except for the captain."
Stiles does a double take. "Derek is still here?"
She gives him a knowing look. "She's his sister, Stiles."
"Oh. Right, yeah. Okay. Okay."
Stiles steels himself and approaches the bed, trying to avoid meeting Derek's eyes.
"Hey, Cora, uh, how are you? Wait, no, don't answer that. Hah. Um, so I just thought I'd come and apologise for the whole 'breaking your leg' thing, you know."
He tries to keep his hands still and fails miserably. They flail around in the air wildly.
Cora gives a weak laugh. The healing potion tends to make people a little woozy. "'S okay." She mumbles. "Part of the game."
Stiles is visibly relieved. "No hard feelings then?"
Derek stands up. "I wouldn't go that far." He growls.
"It was a rhetorical question," Stiles sighs, forcing himself to meet Derek's murderous gaze. He'd be lucky to come out of this alive.
"Outside. Now." Derek snaps.
And the next thing he knows, Stiles is pressed up against the wall, being yelled at by Derek Hale.
"If you ever hurt my sister again, so help me I will - "
"Hey! Dude, chill! It's Quidditch! I'm a Beater. I'm not happy that her leg's broken, seriously, but I was just - c'mon - "
Stiles is finding it more and more difficult to form words. He knows he shouldn't love the smell of Derek's sweaty Quidditch uniform, but there you have it. He gasps as Derek fists his shirt even harder - oh man, did he just think that? - and pushes him into the wall hard one more time before letting go.
Stiles doesn't trust himself to move, so he just clings to the wall as Derek runs his hand through his hair, frustrated. He would describe this whole experience to Scott, later on, as profoundly terrifying yet intensely arousing ("ew, Sitles, I don't wanna know!").
"Hey, it's okay, I get it," Stiles finally breaks the silence. "She's your sister, man, it's okay. but you've got a bit of a temper on you, huh. Just. Chill."
Derek resumes glaring at him but looks slightly relieved.
"Sorry." he grunts, staring at a spot on the wall next to Stiles's face. "Over-reacted."
Stiles grins. "Apology accepted, although you could work on your execution. Maybe a smile, a bit of eye-contact?"
Derek's frown deepens and Stiles suddenly wants to get out of there, simultaneously fearing for his life and desperate to free his boner from the confines of his Quidditch pants.
"Anyway, good game! See you round!"
He leaves as quickly as he can without actually running.
Derek returns to Cora's bedside feeling embarrassed and grumpy. To his dismay, Cora is wide awake.
"Did you just threaten Stilinski?" She demands, giggling. When he doesn't answer she laughs even harder. "Oh my God, Derek, you totally pushed him up against the wall and threatened him! I saw the whole thing through the window! I have literally never witnessed something so aggressively sexual in my life."
She laughs so hard that Derek has to steady the hospital bed, worried about her leg. He treats her to his trademark glare and suffers in silence. He hadn't meant it to be sexual. In fact, it wasn't sexual. At all. He was just angry.
"C'mon Der, just admit you wanna bone him and get it over with," Cora teases, and Derek knows he will never be able to live this down.