Stiles is thirteen and a half when he sees her.
Kate Argent is across the street from him and standing next to her is Derek Hale, smiling like that bitch couldn't kill his whole family. Stiles is walking home with Scott – because his mom had 'business to attend to' which was code for meeting with Talia to protect Beacon Hills – when he spots them together. Derek has to be seventeen, not even legal yet, and Kate has to be in her late twenties at least. Scott notices him staring at Derek and Kate.
"What's wrong, Stiles?"
"I need a favor."
"Anything."
"That lady over there – and I use that term loosely – is Kate Argent. I'm gonna go warn Derek, I need you to act impatient in like thirty seconds to get me out of there. Can you do that?"
"Of course." Scott looks so determined and man is he adorable.
Stiles smiles at his friend before crossing the street, trying to think of a feasible excuse to talk to Derek.
When he gets up to Derek, he reaches up and taps the larger man's shoulders. When Derek turns around he doesn't look angry or miffed or ever vaguely displeased. When he looks at Stiles he actually looks like he recognizes Stiles. He quickly remembers meeting Derek briefly in the hospital.
"Hi, I don't know if you remember me, but we met in the hospital a while back." He starts out, "I just…What you said, it…it really helped. People always gave me these looks like my mom was as good as dead, but you…you didn't do that, so I just wanted to say 'thank you'." Stiles smiles before hugging Derek and he knows it's really forward, but Derek just goes with it – and man is that a change – and hugs him back.
Stiles rests his forehead on Derek's shoulder and whispering, "You need to get away from Kate Argent. I know you have no reason to trust me, but she's a hunter and she's crazy. Get away from her as fast as you can." He pulls back, looking at a shocked, slightly horrified, Derek and a pissed looking Kate.
"Stiles! Come on! My mom's waiting!" Scott calls from across the street.
He smiles again, "Sorry for interrupting, I just…wanted to tell you that." He turns around and darts back across the street to Scott and the two of them start walking again.
Stiles looks back to see Derek making an excuse before crossing the street after him.
"Oh fuck!" Stiles whispers, quickly dragging Scott around a corner.
"Why is he following us?" Scott asks, freaked out.
"Because I kind of told him Kate was a hunter!" Stiles helps Scott over a fence.
"Why would you say that? You could have said that your dad's arrested her or she's crazy or something!" Scott questions as he drops down on the other side of the fence.
"Because I didn't have time to think." Stiles jumps down and grabs onto Scott's arms.
"Take a deep breath and hold it." The Fay instructs.
Scott follows his best friend's orders and closes his eyes to boot. Stiles quickly calls up all the light he can manage before picturing Scott's house – their original destination – in his head. He feels his powers pool in his chest before he pushes it outward.
When Stiles' light powers down, he and Scott are standing in Scott's room. It doesn't take long for Scott to go running to his bathroom and hurling his lunch into the toilet. Stiles follows his best friend, rubbing his back gently.
"Sorry, buddy. I know how much you hate teleporting."