She liked to watch them when they were all going about their normal lives, at their school with their small talk and casual touching, and classes and the Watcher waiting to tell all about the next mission they might undergo. Faith didn't have to go to school, and no one told her to do it or even asked her about it. She was a little surprised that Giles hadn't insisted that she be signed up for classes, but then he wasn't really her Watcher. He was still Buffy's and Faith was left alone to drift.
So she drifted on her own, and watched. It was easy to show people what they expected to see, and when they looked at her they didn't usually look much further than the surface. But if she were honest with herself, she was more than a little jealous of what they all seemed to have in their lives. She hated the thought that she might actually want to go back to school and be a part of their group. She would never be able to admit that out loud to anyone who would do something about it.
Part of her knew that it would be that easy too. If she mentioned something to Giles about missing out on classes and wishing she could graduate, or if she had shown some interest in the studies that her first Watcher had begun her on, he would be dragging her into the library and making all of the calls to get her into school and back on track. It would be good for a while, but eventually it would be another way for her to have Buffy's leftovers and her admission would be exposing a weakness she didn't want them to have access to in her heart. Faith wasn't a part of their orderly little world, and she could only grasp at it when she dragged Buffy out to fight vamps when she should have been in class.
Instead of saying anything, she watched them as they ate their lunches on the school lawn and chatted, letting the sun warm them as she stayed in the shadow of the trees across the parking lot.