Squirrel!
Age: 4
"Squirrel"
The first time Sakura walks up their apartment walls, she was trying to reach her toy shuriken—essentially just Kakashi's old shuriken set, dulled to uselessness "for safety"; frankly, Sakura thought that was utter horse poo—from its high perch on the book shelf.
Later, as Kakashi was picking up stray dulled shuriken, broken shards of what was previously colorful vases and wilted petals off the floor, he wonders how the heck Sakura got her instruments of evil back. He just sighs and shakes his head at the slumbering form of the pink haired child lying on the couch.
The second time Sakura walks up the wall was when she saw a spider-a brown daddy long legs- climbing up the wall, following its climb, puffing her cheeks out and crawling up the walls, imitating the spider's gangly limbs. Later, her nanny wakes up screaming, falling off the couch in her horror at the spider on top of her nose. Thankfully Sakura saves Mr. Long Legs from a horrifying death by asphyxiation.
Now, the third time Sakura climbs up the wall, Kakashi drops his "Erotic Literature".
Under the couch.
He spent the whole time that Sakura was walking up and down the wall, reaching for his fallen book. Not having witnessed the spectacle, he was puzzled to find Sakura reading the Tale of the Utterly Gutsy Shinobi, which he vaguely remembered putting at the top shelf in order to tease the pink haired child. He must've hit his head while searching for his book under the couch.
By what seemed to be the hundredth time that Sakura scaled any lateral surface using only her chakra, Kakashi finally notices. He watches as she easily climbed up a tree in the park, coming closer to observe a squirrel eating its nut, sneakily getting closer until the creature gets startled. It runs away, throwing the remains of its meal at the curious pinkette, causing her foot's hold on the tree to falter. Kakashi was under the tree in less than a second to catch her falling form, but she catches herself on a branch, channeling chakra to her hands to stick to the tree. She laughs as she sees Kakashi standing underneath her, the Copy-nin relaxing his stance, then abruptly lets go of her hold on the branch, expecting her 'Kashi to catch her.
He does.
When he puts her down, he gives her rump a reprimanding tap, a warning for her not to do that again. Then he turns to her, giving her an eye smile, and asking her where she learned to do that.
"Oh, that? Easy! 'Kashi does it all the time, so I just copy the Copy-nin!" Sakura responds, giggling at her own play on words, earning her a wider smile from Kakashi, his eye lids crinkling shut.
"Maah, maah, Sakura-chan, you're growing up too fast. You're making this old man feel even older." Kakashi replies, ruffling her candy floss hair, mussing it up in the way he knows annoys her.
They walk away, Sakura oblivious, and Kakashi cautious as he felt two chakra signatures observing Sakura's misadventure moving away.
Danzo rifles through the documents on his desk. A small report catches his attention.
Sakura Hatake. Four years old. Able to manipulate chakra efficiently. Qualified for recruitment.