Truthfully, for Scott, it's more of a need than a want, even if he isn't entirely admitting that just yet. Stiles was family long before he was pack and he was a loss Scott had never recovered from, and at this point, he's still alive. He doesn't even want to know what that hole will look like when he's really gone.
There's a sharp intake of breath before Scott moves over to sit next to Lydia on the edge of the bed. He runs his thumb against her fingers and rests his head on her shoulder. He doesn't have to say anything, because she knows--sometimes he just has to have the physical contact. Whether it's because he subconsciously feels like it will keep her from disappearing or just the reminder than she is there is debatable. But either way, sometimes he just doesn't have words any more. He's pretty sure neither of them can say anything new about any of this anyway.