Her Lips
There's a quirk to her grin, one that speaks of devilishness and shows her trickster spirit, which sets off a small flash of fear and an even larger sense of dread within him. She splays it lazily across her face when she plans a deviant act and sees it to completion, which most often lands one or more of her companions in an undesirable situation.
There's a grim edge to the curve of her mouth when she becomes determined, her will set in stone and irreversible. The harsh line added to her face causes him a small bite of unease that pushes his pulse upwards, hitching in a nervous fashion.
Sometimes he watches her mouth flatten out and twist as her teeth slide over her bottom lip, ponderously pursed, and she mulls over something. Her incisors scrape the soft but surprisingly tough flesh as she tries to solve a problem in her own creative way.
Then there are the rare times when he sees her mouth soften and become a little bit more pliable, most often when she's unsure of herself and her doubt causes her lips to waver and tremble more than usual. Her mouth doesn't open as widely, as if her doubt isn't allowing her lips to part easily, making the softness of her voice even more noticeable.
However there are times when a wave of happiness rushes across her face, tugging her lips into a gentle smile. And then he can't help but be pulled into a smile too.
There's something entrancing about Toph's lips that Sokka just can't place.
AN: I'm going to try to do a one-shot for each scenario/paragraph, but they'll most likely be posted after I have some weird spike in inspiration so it won't be a regular story. Sorry about that. I hope you're interested enough to continue to read it and if you want to suggest something I'm open to it and maybe it'll help me write faster. Thanks. (Disclaimer: I don't own A:TLA)