The group was sitting at their usual table outside with Stiles, Scott, Lydia, Allison, and Isaac.

Stiles: Holy sh*t...

He says it breathely while looking at you.

Isaac: Who's that?

Isaac looks at you curiously.

Lydia: That's Derek's sister.

Stiles whistles while looking at you

Lydia: I know...

Scott and Alison Just look at you curiously. The only people that knew about you from the group were Lydia Scott and Allison, since they'd done their research.