a short, slightly nsfw drabble written for a tumblr prompt meme
Zuko jerks back with a yelp, gripping the sheets. "Aang!" His eyes whip to Katara's on other side. "Did you see—?"
Katara gulps to catch her breath, the muscles of her leg shifting, twined over Aang's. It happens again - the line of his spine pulses with light, before dimming again. Aang is heedless, his face buried in the crook of her neck, hips pumping slow.
Katara's trying to figure Zuko out. "It's okay," she breathes, blinking through a daze. It takes her another moment to continue, forming her words over the persistent grind of Aang between her legs. Zuko catches himself watching. His face burns hot.
Katara gives him a breathless smile. "It just means - he's letting go completely. That's all. He's not going to hurt us." And then a smirk twists her mouth. "It means you did something good."
"I—what?"
Aang - the Avatar, that Aang - trembles in her grip.
It occurs to Zuko just now that Katara is completely unafraid to touch him. How? She cups the back of his neck, the white-blue glow splitting into beams through the cracks between her fingers. Zuko rubs his eyes. Aang isn't the only one transformed. The light reflected on Katara's skin makes her shoulders and her flushed cheeks gleam, warm and dewy, the sweat on her collarbones dazzling like the sun bouncing off the sea.
A shimmer of giggles reaches his ear. "Pick your jaw off the floor, Zuko."
He doesn't think that's quite possible yet. His eyes trail Aang's tattoo with the breathlessness of scaling a mountain, widening at each intermittent bloom of light - from under Katara's hand, down the line of his spine, curving past Zuko's object of interest before he had gotten distracted, to the strong sinews of his calves.
A mythical thing, sandwiched between them in a homely guesthouse bed.
He tries to catch Katara's eyes over Aang's head again but they're closed. Zuko breathes in, his chest stirring as he once again becomes aware of the the steady stream of whimpers that come from them both. It's a good thing that Zuko doesn't deter easily. He grips Aang by the hips, thumbs pressing in, skin on luminous skin, and presses his mouth flush to the glow between his shoulder blades.