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Itachi's pale skin has never looked more appealing.
It's tinted pink from the warmth of the water around them, damp and soft as water clings to his neck and Kisame can't help himself as he leans in to trace his tongue along his neck, chasing the drops collected there.
"Kisame," Itachi says in that warning kind of way but Kisame only chuckles.
"Have you never wanted to do it in an onsen?" he asks, voice a deep rumble as he trails his lips up to Itachi's ear, not missing the way his breathing picks up at the question.
The place is empty of everyone but them. The bathhouse is small and too far out of the way for anyone to spend the weeknights there so they're lucky to have it all to themselves.
Kisame plans on making use of this.
"I...hn," Itachi's words might fail him but his bodies reaction is all Kisame needs to know he is right.
He presses a few more kisses along his neck, lips parting to let his sharp teeth lightly graze in the way he knows drives his Itachi wild.
Sliding a hand along his waist he lets it drift lower, curling his fingers along his length. He gives a few long slow strokes and smirks when Itachi's hips jut forward seeking out more.
"I think I know just the thing for you," he says and chuckles when Itachi eyes him.
Moving back from him, Kisame sinks into the water, letting his gills take over breathing for him as he swims back to Itachi. The Uchiha's hands settle on his shoulders as Kisame's lips curl around his dick, taking him into his mouth.
Kisame's been saving this particular talent for a special occasion.
He takes Itachi's length deeper into his mouth, well aware of the way his gills produce bubbles around him as he sucks him off. Above him Itachi moans, fingers curling against his shoulder while one curls in Kisame's hair and he loves the feeling of it.
Hollowing his cheeks, he bobs his head a few times before pulling off to the tip. His tongue teases along the slit, lips wrapping around him and sucking hard enough to draw Itachi's hips forward seeking out more.
When he takes him into his mouth again he flares his gills creating bubbles and vibrations in his mouth and along his dick that have Itachi jerking forward again. His hand moves up along his thigh, teasing over his balls and then back along his ass to gently press a finger into him.
It's all Itachi needs to jerk forward again, fingers fisting in Kisame's hair as he spills in his mouth. Kisame is quick to swallow around him, gills fluttering against him again and Itachi whimpers at the over-stimulation.
"Kisame," he's panting when Kisame finally pulls free and surfaces, a smirk plastered over his lips.
Itachi's more flushed than before, sweat and water on his brow. Kisame loves how pink tinged his usually pale skin is and crowds back into his space.
This time Itachi welcomes him more readily, arms settling around his shoulders as Kisame lifts him and lets his hand slide down to his ass.
He has plenty of fantasies involving just this scenario and since they're all alone, Kisame plans on playing out every one of them.