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You notice he has been tense and jumpy lately so you offer to spar. You naturally end up on top of each other and you realise neither of you are feeling platonic in that moment. You ask if you're misinterpreting the hungry look he's giving you. You aren't. He kisses you and it gets heated fast. You push him away and say, "Not here, meet me in the bath cavern in 15 minutes. Bring blankets"
You first go to Katara to ask about some herbs (contraceptive, not that Katara knows about that function yet). You then go to Toph, who obviously can tell something is up. You ask her to close the doorway up to the cavern (there is a skylight) because you and Sparky don't want to be interrupted. Toph says "About damn time" and follows you. Before closing up the cavern Toph yells "Sparky you had better not come out until you are less cranky" and closes the door. He gives you a look. "It was either that or tell everyone not to come in because I want to save an ostrich horse by riding a cowboy". He made a noise at that but eyed you appraisingly. "Talk in the hottub first, if we are doing this we are doing it right".
You undressed yourself, then him. You wanted him to be clear how much you want this. Then you both get in the tub. "First the unsexy safety rules, then the fun stuff. By that I mean limits and do not donts". Once that over (the safe word is cabbages) you get to the fun stuff: fantasies. Then it's up to the good bit.
You walk over to him and straddle him before he kisses you like you are a drink of water and he's a man dying of thirst. You pull away reluctantly, knowing the hazards of starting this in water. "Blankets, now". He pulls you out and gives you both a quick dry before pulling you on top of him. You rub yourself over him while putting a hand under his chin so he looks you in the eyes. "This is so you are completely sure that I am 110% okay with everything we are about to do". He nods, but starts grinding into you. Clearly he too hasn't had much chance for uninterrupted alone time. You give him a quick "good" and a smirk before sitting down on him. Hard. He throws his head back and a small lick of flame escapes. Interesting. You get settled and tip his head back towards you. You look directly into his eyes as you start to move. He looks at you like you are Agni himself. Then he grips your hips and starts to reciprocate. You can tell when some of his blood returns to his brain because suddenly you find yourself on your back, the firebender on top of you pounding into you at a pace that makes you see stars. He starts touching you there and you are gone. He pounds you through your release, then slows grinning. "Ready for position 2?"
In your earlier discussion you agreed that The Good Vanilla was the best place to start but your fantasy would be second. He pulls out of you and helps you flip over onto your knees. He helps you get your head onto a makeshift pillow then puts his hand gently but firmly around your neck. With his other he lines himself up.
Just as he gets a pounding rhythm going, accentuated with alternating spanks and soothing rubs on your backside, you hear the telltale sounds of earthbending. With quick reflexes gained over a lifetime growing up with Azula he aims a messy ball of flames at the doorway. You are vaguely aware of a surprised shout but you are too blissed out to care. You are vaguely aware of a quick argument that happens outside and the door being hastily replaced before the faint sound of surprised yelps moves away at speed. Throughout the ordeal Zuko barely altered his relentless rhythm.
You have never come so hard in your life. He follows immediately after with a rough moan and slumps.
***Outside***
Aang yelps. He thought it was strange that a rock wall blocked the entrance to the baths, and he heard what sounded like noises of distress and fighting inside so he lowered the wall ... To be greeted with a blast of fire. He quickly whips open his glider to fly to Katara. She grabs Toph, who has a knowing smirk, only to race over and hear ... Something she could have lived without ever hearing. At least Sparky took her advice. She pulls up a new wall and yells a hasty "toss rocks at the door when you're done" before raising an earth platform and getting out of the seeing zone. The others yelp. "But what if they're hurt???" Says a startled Aang, looking ready to pull out his glider and head back. "Trust me," says Toph, "if they are I REALLY don't want to know ANY of the details". Katara puts the lists of herbs that she mixed in a tea for her earlier together with noise she just heard Zuko make. She blanched. "They, they were..." "Helping Sparky destress? You betcha. And if you don't mind Sugar Queen I don't want to be without seeing a range of whatever was happening in there again if I can help it". She glares her milky green eyes pointedly at Aang. "Also I am NOT explaining any of that to Twinkle toes". Katara looks sheepish.
"Position 2 was the best idea I ever had" you said dreamily from your spot in his arms in your pile of blankets. Zuko makes a low, almost purring noise in agreement while nuzzling your hair. "I suppose we have to face the music sooner or later". You pull him to his feet and both slowly start getting dressed together, sharing slow kisses as you do. You walk back to camp, hands interlinked.
"Finally your heart has calmed down Sparky, I was worried it was a permanent condition" Toph says. Zuko smiles shyly. You sit down against a tree and pull his head into your lap to start stroking his hair. Sokka looks like he's the one ready to have a heart attack.
"Shit Sparky, since when were you open to cuddles???" Toph was obviously ecstatic to see her favourite emotionally stunted grouch accepting human affection. You whisper something quiet to Zuko and he shuffles closer to you, making room on the blanket. "It's free real estate Toph" he mumbles sleepily. She jumps at the chance. Literally. "YOU'RE SO WARM" she all but yells, snuggling closer. He mumbles something that vaguely sounds like "firebender" but he is clearly too blissed out to care. "Not fair, I want a walking heat pack too" Sokka exclaims. Toph just hits her heel on the ground and hears an exasperated yelp. "Come one step closer and not even Foo Foo Cuddly poops will be able to save you. His heartbeat has finally slowed to a normal rhythm to match hers, do anything to change that and I will learn how to make an entire cliff just to throw you off of". She then settles into the best nap of her life. She doesn't care how gross the methods, she will be walling you in with Sparky every chance she gets.