#ctbmto asks

First, Kiyo would be made immediately aware that this child is Sakumo, because Jiraiya has carried the disgruntled child to the front door himself, Minato is there, hiding behind his mentor because- technically- this was entirely his fault and shouldn't have accepted his mentor's offer to find a "willing" test subject. Minato thought it would be Orochimaru, or Jiraiya himself- he had never expected the toad sage to spy a passing jonin (isn't that the White Fang?!), and proceed to ask a favor of a man who apparently had never said no to Jiraiya in his life. So his mentor is at least 50% at fault, actually.

So, here's the thing. You would think Sakumo got physically turned into a child, but is still Adult!Sakumo with all his memories intact inside, right? That is horribly boring, NO. This is in fact 8-year-old (I rolled a ten-sided dice) Sakumo- who would like to know WHY he is with a giant baffoon that assaulted his person by grabbing him and then refused to put him down, and WHY he isn't in Uzushio, there are too many ugly trees here it's nauseating-

Bold take from Narwhal: Kakashi, in fact, got 100% of his childhood personality from his father. Everytime we see Sakumo flounder at Kakashi's sass, is just overwhelming embarrassment that his parents and mentor had been right/possibly cursed him to have a child that would be his exact copy and he would also suffer as they had.

Now, gods help me, let's say Kakashi is in the same age range when this happens, because magic jutsu and fuck the timeline; Kiyo now has 2 smol, grumpy Hatake on her hands- because Jiraiya dropped Child!Sakumo off at home and then ran away with the vague promise that he'd fix "this"

Straight up, Child!Sakumo and Kakashi get along as well as two strange cats thrown together and locked in a box. And Kiyo is not a large person herself, so it's a goddamn STRUGGLE to physically separate the two, who are actually pretty much equal in skill level, but child!Sakumo has a leg up being slightly stockier in build and apparently experience in wrestling Shinobi-style with siblings/clansmen. Child!Sakumo has no clue who Kakashi is and doesn't believe a word these Konoha Tree-Freaks are saying- there's no WAY he lives in this stupid village-

And Kakashi, unfortunately, understands this is his father, and it's making him hesitate at the WORST times and he is LOSING and can this snarky brat REALLY be HIS father???

"Who could even STAND someone like this!?"

Kiyo chokes on her tea when Kakashi exclaims this, it may have squirted out of her nose from shock and laughter.

Kiyo, is at first, completely flabbergasted by child!Sakumo's behavior. She can't seem to connect the man she knows from the series, the man she has grown to know so well, with this perpetually frowning, snippy child. She calls for Hitomi. Hitomi laughs and seems completely unfazed by the moody child's biting words. She gives Kiyo a pat on the back and wishes her good luck, leaving to track down the toad sage and see how far along he is with unfucking this situation.

Pretty soon, though, Kiyo falls into her usual rhythm, except it's Kakashi x2, and finds it's actually pretty simple to organize the two so there's minimal damage to the house. She is EXTREMELY happy that, apparently, for all the metaphorical hissing and spitting that child!Sakumo does, if she grabs him up in a hug, his words are still just as sharp and pointy, but his physical reactions are vaguely ragdoll-y and accepting of any manhandling.

Child!Sakumo spends a majority of his time wrapped in a quilt and sitting in Kiyo's lap because she won't let him go and he never fights it.

Please, if you will, imagine a sulky smol Sakumo, bundled up in a quilt, trapped in Kiyo's lap, because her arms are around him while she knits or crochets. Kakashi can't stop himself from staring VERY INTENSELY, and every now and then Sakumo will catch his gaze and throw his chin up in challenge? defiance?

With Hitomi's nagging/hounding, Jiraiya and Minato figure out how to reverse the jutsu's effect and within 48 hours Sakumo is once again an adult and- does he have any memory of being a child? OF COURSE HE DOES.