Meet Judgement by the Hounds (слэш)

“Who are you? There are very few shinobi of your calibre that we don’t know about yet. Especially someone as old as yourself,” Little Kakashi demands.
“Yeah, you look even older than sensei,” mini-Rin chimes in from behind mini-Kakashi, crouching next to mini-Obito.
He’s a little offended. If Minato is considered old at twenty-three, then Kakashi is practically a fossil. Apparently, none of these kids understand the concept of living past like, fifteen.
–
Hatake Kakashi had honestly (and perhaps naively) thought he’d already hit his midlife crisis by the time he’s thirty-two. Being pushed into the Hokage hat after a war tended to do that to one.
But finding himself almost twenty years in the past (parallel universe/elaborate genjutsu/weird drug induced coma?) probably takes the cake for the most insane twist of fate.
OR: Kakashi wakes up twenty years in the past, with the chance to save all his loved ones from their deaths, and himself from tragedy.
(THERE IS NO PEDOPHILIA OR GROOMING IN THIS WORK. They are both consenting adults when the romance begins)