In the second episode, when both he and Scott are at the hospital, Stiles sees Lydia and begins talking to her. He asked if she remembers him and that they sit behind each other in Biology. Of course she had that thing in her ear and didn't hear him... When her boyfriend comes out later and they kiss each other, Stiles looked mad. I know shows usually do this to foreshadow later on. So, i'm thinking he has a puppy crush on her. (No pun intended...)
I didn't see the first episode, so I don't know if there are any hints there.
Also, on the clips where they show what's coming up on the season, I saw a glimpse of Lydia crying on the floor of her room and Stiles is there with her.
So, what do you think? Am I looking into it to much? Would you actually like to see them together?