(This turned out to be trickier than I thought it was going to be. Hope you like it bb!)
Sheriff Stilinski is not an idiot. His entire career revolves around his ability to pay attention to things other people don’t notice and draw conclusions from his observations. And, all right, he may turn a bit of a blind eye when it comes to his son (not like he’s ever going to admit it, but he’s a little embarrassed he didn’t pick up on the whole supernatural thing sooner; didn’t do a great job there), but it’s not exactly surprising; they may know each other inside and out but that also means they know how to hide things from each other. Still, he’s not blind; it only takes him a week to realize Stiles is seeing someone. At first, the sheriff thinks something supernatural’s going on again; Stiles is always on his phone, texting madly, which isn’t unusual, but he’s careful not to leave his phone laying around like he usually does. The one time he does leave it laying on the coffee table, it buzzes while the sheriff’s laying on the couch watching tv and Stiles nearly breaks his neck diving in from the kitchen to grab it.
"Everything all right?" the sheriff asks mildly, and Stiles flushes deeply when he says, "Yeah, everything’s fine."
It’s not the supernatural, though, the sheriff is pretty sure. Stiles has been very open with him since the big werewolf reveal and when the sheriff carefully asks “Anything new on the weird stuff front?” at dinner a couple nights later, Stiles seems fine with telling him with new developments with the nemeton, so it’s nothing to do with the supernatural - unless Stiles is lying, of course, but the sheriff doesn’t think he is. The next night, the sheriff comes home from a late shift to find Stiles sitting slumped at the kitchen table over a pile of homework, and when he goes over to shake him awake and send him upstairs to bed, the sheriff pauses at the sight of a bruise on Stiles’ neck just below his ear. Oh, he thinks.
"Deaton says it’ll wear off," Scott says when he opens the door to his house.
"What will?" Stiles asks suspiciously. The last time he saw Derek, he was unconscious and covered in a fine red powder and Isaac and Scott were cramming him into the back of Allison’s car. It’s been almost two hours since then; he and Lydia had been left to deal with the faerie, who absolutely refused to deal with werewolves or hunters. Stiles had dropped Lydia off at her house because she’d insisted on taking a shower after.
"He’s, uh," Scott gestures vaguely. "Well. It’s kinda like he’s drunk. If he could get drunk." As if on cue, a bunch of people in the living room break into laughter and Stiles raises his eyebrows.
"Was that Derek?”
Scott grins faintly. “Yeah, dude. He’s kinda fun.”
"Fun," Stiles repeats, grinning wryly. "I’ve gotta see this."
Scott’s grin widens and he steps back, holding the door open so Stiles can step inside. Derek’s sandwiched on the couch between Isaac and Allison and just that is odd enough - Derek’s never seemed overly fond of being in close proximity with people, especially not Allison - but even weirder is the wide grin on his face when he turns to watch Scott and Stiles walk into the room. Stiles stares; he’s never seen Derek smile like that, except that time at the sheriff’s station when he was schmoozing up that deputy. This smile seems genuine though, as does the cheerful note in Derek’s voice when he slurs, “Heyyyy, Stiles!”
"Hey dude," Stiles replies, jamming his hands in his pockets. "You look stoned."