au where derek gets hit with some sort of spell and is transformed into a puppy, like one of those huskies that looks like it's judging you all the time
and scott and stiles aren't really sure how self-aware he is in there because if you call his name or say something to him he'll look at you and bark like most dogs, but he doesn't respond to things like "if you can understand english raise your left paw" so they decide to take him to deaton for advice on what the heck is going on/how to reverse it
(on the way to the clinic derek pees in the back of the jeep, like the all-over-the-back-i'm-never-going-to-get-the-smell-out kind of pee according to stiles)
and after a batch of routinely-cryptic answers they're not much better off than when they started, so they decide to take him back to scott's house because "the loft is kinda dark and enclosed, and besides we can't just leave him there by himself"
when they get home isaac is sitting on the couch and when he notices scott holding derek he gets all wide-eyed like he's either going to dissolve into giggles or start crying and goes "you got a PUPPY?" and scott's like "wait no it's not–" but isaac jumps up and runs over and the moment he comes close enough to smell derek he just stops with his mouth open and looks at derek and looks at scott and goes "–oh" and then looks back down at derek and goes "… oh." again
the first time peter sees derek post-transformation he lifts him up over his head like "simbaaa" and derek is wriggling and yelping and scott's like "dude put him down!!" and peter rolls his eyes but he sets him back on the ground and derek runs behind scott's legs and peers out and growls at him
and at first he's the fucking grumpiest thing ever and gets all snappish whenever anyone tries to pet him like yup that's definitely derek but over the next couple of weeks he becomes progressively more puppy-ish and retrieves sticks that stiles throws in the mccalls' back yard and one night there's a thunderstorm and scott wakes up to find him at the foot of his bed whimpering because he's scared but he's too short to jump up so he lifts him onto the bed and derek falls asleep curled up on his chest (he's too heavy to do that but scott doesn't have the heart to move him)
and stiles is like "i think i like him better this way" but he and scott are both starting to worry that the spell will become irreversible and derek will stop being human at all
idk how they change him back but it happens i'm not a writer ok
but one day afterwards they've pulled up the sofa and a bunch of chairs to the table in derek's loft because they're strategizing against whatever the latest threat to beacon hills is, and it's late at night and scott dozes off on the sofa and when he wakes up he finds that derek has somehow 1) fallen asleep as well and 2) flopped over so that his head is on scott's lap like he did when he was a puppy and scott awkwardly clears his throat and derek wakes up and it's really awkward and they're both like "oookay we're just not gonna talk about it"
the next morning stiles walks up to them with this shit-eating grin and when they stare at him in confusion he holds up his phone with a picture of them from the night before and they both simultaneously lunge at him but he hightails it out of the loft, almost bowling over a surprised isaac in the process (it becomes a semi-common occurrence and neither of them know how it happens but eventually they decide to just stop questioning it because w/e cuddles are gr8)
also peter discovers that if he whistles derek will instinctively sit up all alert and he does it all the time just to fuck with him
AND THAT'S ALL I GOT why can't we have cute nice things anymore why does it all have to be death sadness and me lying face-down on the floor traumatized by this stupid show
