I don't own the characters, Nickelodeon does. Please don't sue.
…Sokka…
"Toph! Don't go… don't go Toph!"
… Why are you yelling at me Meathead?…
"I'm sorry, I'm so sorry. Please don't go."
… Sokka why are you sorry…
"I didn't mean for this to happen. I tried to hold on."
… What happened.. Sokka…
"I tried to hold on, but I slipped. I failed you."
… Why do I feel like I'm slipping away…
"Toph, I should have said this sooner, but.."
… Said what sooner Meathead…
"I ahh… I love you Toph" He stammered, cradling her lifeless body to his chest.
... I love you too, Meathead...
Sokka's tears dripped warm onto Toph's cold cheek as he pressed her face to his chest repeating "I love you" as he rocked back and forth on the damp blood covered ground.
I'm not sure where in the original story this would work. I came up with it after watching Sozin's Comet but Toph falling from the Airship just didn't seem right in ANY way. I changed it a bit so Sokka could hold her body, not her mangled and mashed remains.