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How does an elite Jonin of the Leaf Village find themselves on the forest floor, disoriented and the wind knocked out of them, having fallen from their relaxing branch (on their day off no less!)? In Hatake Kakashi's case, it was an unknown S-Rank jutsu that he neither expected nor saw coming. Who was this powerful nin that could knock Sharingan no Kakashi, user of a gazillion jutsu, tenured ANBU Captain off his perch in the safe confines of the Konoha forest? One Umino Iruka.
Umino Iruka, Chuunin, Seals Master, Beloved Academy Teacher, Terrifying Mission Desk Worker, #1 Crush of the Leaf Village. The list goes on, but Kakashi didn't know he would be adding #1 Weakness to Kakashi. OK, if Kakashi is being honest, Iruka already held that position but more in a heart-eyes way rather than the current state of disorientation on the forest floor. But, still, the question remains - what was Iruka's exceptional shinobi talent that displaced Kakashi so swiftly from his branch to the floor?
The branch in question still held his book and bento in a tree he just happened to be in at the same time as Iruka's day trip to the river. Complete coincidence. Just two Shinobi with the day off, looking for some relief from the pressures of life. And when he just happened to notice that Iruka was at the river beach by his tree, he decided to observe his activities.
Any shinobi worth their weight in A-Class missions would notice and observe an intelligent, tenacious, talented….handsome Academy instructor outside the village. It was his duty to ensure the safety of Konoha's most precious sensei.
Kakashi had fully intended to make himself known until Iruka prepared to swim and everything went pear-shaped.
Iruka started to take off his clothes, treating Kakashi to a delicious expanse of skin. His eyes swept down from Iruka's strong shoulders, hard pecs, solid torso until his eyes landed on his belly button. A belly button with a shiny silver ring through it with a little dangling charm. A charm he did not have time to make out as he found himself dizzy, losing blood through his nose, and then flat on his back on the forest floor where he was now evaluating the power of Iruka's attack. Was it a genjutsu? Was it an Umino blood-line limit?
The power of the supposed jutsu had nothing to do with the way the sparkle of the ring contrasted against his skin when the sun hit Iruka's topless, chiseled abdomen. Perhaps they could utilize this jutsu in the field...wait, no. Kakashi turns that idea around because no one else can see this, mainly for its tremendous power and not because it involves Iruka's bare chest to execute. Yup, too powerful. That's it. Maybe he should petition the Godaime to classify it as a forbidden jutsu.
"Holy shit, Kakashi? Are you OK?!?" Kakashi can barely track the words before seeing a very worried and confused Iruka hovering over him. Correction, a beautiful, topless Iruka was hovering over him. And his hair is down, and gods, if he could function, he would reach out and tuck some behind his cute ears. Iruka starts to look Kakashi over for cuts, scrapes, and breaks.
Before Kakashi could muster up a response, Iruka shifts over to check his left arm when he sees it. The Charm. A dolphin. Kakashi's world starts to spin, and three Iruka's look at him with concern, "Kakashi, are you OK? Can you hear me?" they say.
Dolphin is all Kakashi can sputter in his mystified state as he proceeds to pass out from acute nasal blood loss.
He wonders if Iruka is as adept at caring for his victims as he is at incapacitating them.