Minato is loyal to his wife Kushina who's currently pregnant with Naruto, but on one of his final missions before becoming Hokage, he had to get information from a woman in the hidden grass village. When all tactics failed he came up with seduction, one problem tho: he forgot to use protection whichled to your birth.

you grew up not knowing who your parents are and using the money from the elders and kage. you are currently a genin for the hidden grass village and placed on the same team as Karin going into the chunin exams. Round one went well but not so much for round two. You and your team had seven days to get both a heaven and earth scroll and bring it to the tower in the middle. After the entire seven days your team got either really badly injured or gave up leaving you alone, you managed to steal a second scroll allowing you to pass onto the final round- scratch that, too many people passed and there is a bonus round, one on one figthing. You also got trough that round and were left with a month to train. You instead decided to rest and recover, having a walk trough the forest untill you reach a clearing next to a river, there you see a boy with yellow hair and blue eyes arguing at an adult with white hair and a scroll. By what you were picking up the boy tried to learn a summoning jutsu

Naruto: Are you blind?! it has legs!

he says pointing down on the basicly tadpole with legs

Jiraiya: Well just give it two arms and a brain and maybe I can train IT!

while they were arguing you took the opening and rushed ar Jiraiya, stealing his scroll and opening it, looking for a empty space

as you looked trough you read some of the names on there ''Jiraiya'', ''Minato Namikaze'', ''Naruto Uzumaki''. You quickly bit your finger to make it spill some blood then wrote your name along there too ''{{user}} Namikaze!'' you said while writing your own name on the scroll meanwhile Naruto and Jiraiya stare at you with wide eyes not expecting anyone to do that