I do not own Teen Wolf or any of the characters represented in this story. This is my reaction to the Hotel California episode since I absolutely abhor the Derek & Miss Blake's relationship on the show. Sterek for the win, always!
Stiles is way more observant and intelligent than people give him credit for. He may be partially to blame for that by hiding behind flailing limbs and rambling words. His ADHD can take the blame for the rest, although it's surprisingly easy to exaggerate things and fake your way through a psychological evaluation in order to get pills to help you concentrate. He does need the Adderall, but probably not the strength and dosage that have been prescribed. He is more than thankful for having it this past year with all of werewolf drama. This brings us back to the point that Stiles sees and knows more than anyone thinks he does.
When Scott was bitten, Stiles spent days researching everything there was to know about werewolves. After meeting Dr. Deaton, Stiles devours the extensive library the man has. When Lydia translates pages from the Argent's bestiary, Stiles teaches himself Archaic Latin and finishes the bestiary himself. He doesn't tell anyone he has an eidetic memory, because Stiles tries to include everyone in everything and that means making Lydia feel useful. His crush on her was also a mask that he hid his bisexuality behind.
His bisexuality combined with his memory and now extensive knowledge of werewolves made for an interesting discovery while learning about mating and mates. He had noticed after Jackson's werewolf resurrection that his and Derek's companionship had changed. There were a lot less threats and wall slamming, and a lot more requests and causal touches. At the time, Stiles had attributed it to learning of Boyd and Erica's abandonment and his need to change his attitude at being an Alpha.
The murder/sacrifices started again in the fall, along with the revelation of the Alpha pack, and Erica's murder. Looking back, he should have seen his role in the pack dynamic sooner. He is Derek's mate, the Alpha Mate, the glue that binds the pack together and offers emotional stability. He would have noticed more quickly, if not for Scott's insistence that he wasn't in Derek's pack and Derek's inability to express his emotions. Although, Stiles believes that his age has something to do with Derek's silence on the matter considering what Stiles knew about Kate Argent and the fire. The point is, he now knows his place in the pack and after the events at the motel he realizes just how important that role is.
When they get back from the cross-country meet and Ethan reveals that Derek is most likely alive, Stiles rushes over to the loft to check on Derek to reassure the pack that their Alpha is indeed alive. He pounds up the stairs and throws the door open calling out to Derek, only to stop dead in his tracks. He sees a rather gloriously naked Derek lying underneath the rumpled sheets of his bed and the back of a woman with bed mussed hair who has obviously frozen in place in her attempt to cover herself. Derek is staring at him with wide, startled eyes at being caught in such a position as he slowly begins to sit up. The woman finishes putting on the t-shirt that she had previously been holding against her chest.
"Stiles, what are you doing here?" Derek manages to get out though his voice sounds rough with either sleep or sex. Stiles finds it quite sexy before the reality of the situation comes crashing down on him when the woman turns around and looks sheepishly up at him.
"Miss Blake?!" Stiles exclaims. "Good morning, Mr. Stilinski." She says timidly back at him.
Stiles anger and heartbeat shoot up and his vision gets a decidedly red tint. He levels an unimpressed glare in her direction as he says, "Seeing as I have just caught you in bed with Derek, whom less than 24 hours ago was assumed dead, I think we can drop the formality of the student-teacher relationship." Stiles eyes shift to Derek briefly and he pauses to enjoy Derek's wince before he focuses his anger to Derek completely. "Care to explain what's going on here?"
Derek seems to have recovered enough from the initial shock to look furious and his eyes flash red and his teeth elongate, "That is none of your business, now get out!" Derek tries to put the Alpha inflection in his voice.
Stiles briefly panics as he sees Derek wolf out slightly and he chances a glance at Miss Blake notices she's almost entirely unaffected by what she's seeing. It's at that moment when his brain registers two things: First, it seems that Derek has decided to share the werewolf secret with someone without the pack's consent, possibly opening them up to a new threat; and second, Derek had sex with his English teacher and essentially cheated on his mate!
The absolute fury that courses through Stiles at that moment feels like an electrical current sparking throughout his body. He is practically vibrating with rage and shuts his eyes momentarily to center himself and sort through the words in his mind that are scorching to be released. His eyes open and snap to Derek as everything takes on an orange haze, like someone put a filter on the world. Derek looks stunned as his wolf features clear instantly. He slowly raises his hands in an innocent gesture and stutters slightly as he says, "S..St..Stiles… This is not what you think it is." Stiles can't process the emotions he can suddenly feel coming from Derek at the moment and instead unleashes all of the pent up rage and fury in the most uncharacteristic way possible.
His body goes deadly still as he begins to speak in an almost quiet tone with a sub-vocal growl to his words, "From what I can see, my Alpha decided to share his supernatural secret with an outsider before consulting his pack and potentially putting them in danger; in addition to committing adultery." Derek expected flailing and yelling from Stiles, but the way he was holding himself perfectly still and the icy venom in his tone of voice combined with his glowing orange eyes had him unable to speak. Derek knew that orange eyes on a werewolf meant an Alpha's Mate, and had seen them on his father.
That was when the last part of the sentence registered as Stiles cut his eyes to Miss Blake, who had finished putting her clothes on as he said, "Jennifer," Miss Blake startles at the use of her first name and she raises her gaze to Stiles. "I imagine that Derek did not tell you that he was spoken for. It is for this reason that I am giving you the opportunity to leave here and never come back. You will not speak of this encounter or of werewolves to anyone. The members of my pack are to be treated as is appropriate for normal student-teacher relationships and if you see Derek around town you will ignore his existence. It would be in your best interest not to test these restrictions as I now have a pack of Alpha werewolves who owe me a favor for saving one of their members' lives." Miss Blake nods quickly, looking thoroughly frightened and rushes to gather her things as she makes her way towards the door under Stiles' unwavering glare.
As the door shut, Stiles returned his focus to Derek. Derek was still staring at him wide-eyed but guilty like he just completed the puzzle of Stiles words and the implications of his actions. Stiles felt bad for putting that guilt on Derek, but all he had been through in the past 24 hours had numbed that feeling. He was done smothering his feelings and placating Derek while he worked through his issues. Obviously that approach was turning out to be a repeat of history and Stiles would be damned if he was going to let Derek destroy things again. This was not only Stiles' pack, but Stiles' friends whose lives were on the line now. It was time for Derek to have a reality check, Stilinski style.
A/N: I'm writing the 2nd part of this right now and it will be up sooner rather than later. I had to leave you hanging as I needed to get off the computer for a bit, but wanted to upload at least part of this story cause it's been bugging me! Let me know what you think of the first part!