Sterek au meet cute where Stiles is a ups or Amazon delivery driver or something and every day he drives his route, delivering packages, and he knows literally every dog on the street, like he knows the one at the house with the rose bushes got bad hips but loves attention so he gotta go up the steps to pet her, the golden at the 2 storey house with the bikes in the driveway loves to sleep on the bench near the door and will roll over and potentially fall off to get tummy rubs, he knows that one pitbull with the massive head who looks terrifying but does full body wiggles he gets so excited when he sees Stiles van pull up, he knows em all.
One day Stiles gets a package to deliver to a big house on the outside of town that's rather quiet, never had to deliver anything to them before, but he pulls up, scanner in hand, package under his arm, and there's a massive... dog? A big black German shepherd maybe? Maybe a husky mix? Laying on the porch, right in front of the door. This isn't Stiles first rodeo (obviously), he knows not all dogs are friendly, so he approaches cautiously, announcing himself while still in safe fleeing distance of his van. The big black dog (?) lifts its head and watches him with an even gaze. It's not wagging, or looking any kind or specifically friendly, but it's also not growling or raising hackles, actually looks kinda relaxed. Just completely neutral. So he keeps talking. "hey big guy, I got a package for your house, just gotta drop it off, okay? Is that okay? Are you friendly? Please don't bite me, I like my insides as insides. You like my insides staying inside too, yeah? Not gunna eat me? We good?" The most he gets is an ear flick, but he's been getting closer the entire time.
This German shepherd maybe/husky/apparently part bear thing is huge, it almost looks like a wolf, but Stiles knows there's no wolves in California. Haven't been for decades. He drops the package next to the door, scans it, takes a photo for proof, steps back, and decides to test his luck. He reaches a hand out to let the dog (?) sniff him. The dog (?) doesn't. Stiles pets the dog (?) between the ears. "Good boy" and turns around to go back to his van. The dog (?) watches him go silently. Stiles gets back in he van and drives back down the road, back to the rest of town and the rest of his deliveries. Derek, still unmoved from his place on the porch, watches him go and thinks "I AM a good boy"