AN: So I haven't written in awhile but am now in love with Avatar! Sorry if this is rusty, hopefully more, and better, to follow.
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Katara stared out the window of their small room as rain patted against the pane, Aang snoring softly on his stomach beside her, one arm dangling over the edge of the bed while the other loosely rested on her hip. A distant roll of thunder had woken her a few minutes before, and at first her sleep laden mind had thought that Toph must be outside in the yard 'fixing' her flower garden. She was drifting off to sleep again, dreaming of the four of them picnicking in the garden, when the rain began. Katara could not help but watch the water droplets combine and trickle down the window, still fascinated by water even after mastering it. She sat up a little, resting her weight on her arm, and listened to the pattering of the rain as it mixed with the increasingly loud thunder.
The black background was briefly lit as a lightning bolt sparked through the sky. Katara looked down at Aang's scar, reaching her hand out and lightly tracing it with her finger. It had grown with him; remaining a thick, rough, pink mass of dead tissue marring beautifully soft skin no matter how many times she tried to heal it. She slid her palm over it, feeling the jagged texture grab at her skin, as she replayed that horrible battle in her mind, remembering Aang fall again and again.
"I don't mind it, you know." Startled, Katara pulled her hand back as blue eyes met gray. "The scar," Aang finished.
Katara's hand returned to the scar, her palm flat against its center, as she let out a soft sigh. "I hate it." Aang's hand tightened on her hip, his thumb moving in circles against the soft fabric that covered her skin, as he watched her face, but said nothing. "I hate the constant reminder that I lost you once."
"You brought me back."
She looked back at the window, silent. The rain blew in sheets as thunder filled the almost constantly lit sky. "I could lose you again."
Aang rolled onto his side and sat up, Katara's arm sliding off of his skin as he blocked her view of the window and forced her to meet his eyes again. His mind raced as he searched for the right words to say. He could not tell her that she was wrong, because, as Azula had proven, she was not. He could tell her that they needed to make the most of the time that they had together, but they already were. He briefly thought of telling her that they would be together in the afterlife, but she already knew that, too, and she only thought about his scar during storms, anyway. So Aang brushed her cheek with his hand, feeling her soft smile, and leaned forward.
He tenderly brushed his lips against hers as his hand slipped into her hair. He kissed her forehead, then each cheek before resting his lips against her mouth. "I love you."
She let out a sigh as his hand gently massaged her scalp. "I love you, too." She wanted to say that she loved him again but suddenly he pressed his lips to hers and he was kissing her so sweetly; his lips brushing hers over and over in a soft rhythm as though he could not help himself and every now and then he would lightly suck on her bottom lip for just a second. His hand moved to the base of her neck in order to pull her closer as she brushed her tongue across his lips, and she did not feel like talking anymore, the ache to be close to him too overwhelming to ignore.
…
Aang pulled Katara closer to his chest and buried his nose in her hair, her hand in his, their fingers intertwined, his breath soft and his heartbeat constant against her back. She felt his pulse in his hand and smiled, drifting to sleep as the thunder rolled on.