Urm...quick warning again, even though they're in the summary, this contains mild yaoi and shouta as well since Itachi is in his early teens and Kisame is in his twenties I'd imagine.
Itachi had learned many things at a very early age. He'd learned how to efficiently kill an armed, adult male before most children could properly tie their shoelaces. He'd learn how to disarm an armed adult male without killing him before those same children could ride a bike.
One thing he hadn't learned to do was masturbate.
He'd reached ANBU status far too soon to be enrolled in a sex-ed class. He'd left Konoha before he could even begin to consider the strange feeling in his stomach that occasionally appeared. And, seeing as he'd been raised to ignore his feelings, he didn't actually get his first erection until later than most boys his age.
When he finally did though, he was on a mission.
Hiding between a leaning sheet of plywood and his partner's toned chest.
Watching their enemies set up camp and discuss random nonsense with each other.
And all Itachi could concentrate on was the growing arousal between his legs.
Kisame hadn't appeared to notice. But as far as Itachi was concerned he did…and was doing everything he could to drive Itachi insane. His breathing seemed heavier than normal…as though he was doing so specifically to hypnotize Itachi with the warm press of his body against Itachi's as his chest rose and fell against Itachi's side, making his skin prickle.
A bead of sweat trailed down his temple and he shifted slightly, trying to cross his legs.
Kisame shifted as well. He could feel the question in Kisame's face. What the hell's wrong with you? Itachi could sit for hours without moving normally.
These hours had never included a pulsing hard on before.
The fireside ninjas continued their idle chatter; the lookout wasn't doing his job very well. He kept getting sucked into the conversation.
Before Itachi knew what was happening, he'd slid one of his hands down to the waistline of his pants. He didn't know what he was doing, but he knew he needed to do something to release the pressure that was building up to an almost painful state.
His hand moved silently under the waistband of his pants and then between the elastic of his underwear and the bare skin of his abdomen. He bit back a shudder, freezing. Kisame simply continued his distracting breathing, oblivious.
His fingers brushed over the engorged flesh, making him shiver. Kisame, not bothering to look down, pressed himself closer. He appeared to think that Itachi was cold. Despite Itachi's standoffish personality, Kisame took it upon himself to make sure the boy stayed healthy…normally it annoyed the hell out of him, but right now the closeness just spurred the strange heat in his lower torso.
Itachi closed his eyes, not the smartest thing to do when on a mission, but he had the feeling that screaming was even stupider.
Even if he didn't know what he was doing, his body knew what it needed. His hand wrapped around the shaft, squeezing lightly. His eyes widened, but he refused to let his body react any other way.
The ninja were eating now. Something they'd packed and heated. Itachi forced himself to keep his eyes open and his body still as he began to move his hand up and down his cock, biting back the soft, needy noises that came with this sort of thing.
Kisame shifted again and Itachi froze. He always kept his hands in his cloak…Kisame couldn't have noticed. He waited until another slight movement indicated that Kisame was once again watching their enemy. That was all Itachi needed…he honestly couldn't have kept himself from moving much longer anyway. His body was demanding things he'd never imagined right now.
His pace began to quicken and he couldn't stop the slight sway his body had adopted. Actually, he hadn't noticed it in the first place. The tiniest gasp escaped his lips and his legs began to quake.
He bit his lip, pitching forward.
So much for the mission, so much for not being spotted, he was about to fall face first into their camp.
That is, he almost did. A firm hand clamped over his mouth, muffling his moan and an equally firm arm wrapped around his stomach, pulling him back against a solid body.
Kisame's lips were nearly touching his ear, he could feel them. And then that gruff voice was whispering not to move as the arm on his waist slid down and a large hand pushed his own small one away from his cock, wrapping around it himself. He stroked the pale flesh once, twice, five times, before Itachi came, his shocked cry silenced by a large blue hand.
Shaking violently, Itachi fell back against Kisame, far too aware of his soiled state and the steady beating of Kisame's heart behind his cloak.
And just like that, they were gone, back at their own makeshift camp.
"They're sloppy and inexperienced. We can easily overtake them in the morning." Kisame said as though nothing had happened.
Long after Kisame had fallen asleep, Itachi lay awake, hot and irritated under his blanket. He'd tried multiple times, without success to mimic the motions Kisame had used to make him cum so quickly and intensely. After yet another failed attempt, the pale boy finally drifted off into a fitful sleep, a strong, muscular body and a slow, comforting heartbeat dominating his dreams.
Weeeeellllll? This is one of my favorite pairings actually...I might cry if I've botched them. But don't let that stop you! I need to know! Review!