Is the sister nicknamed Flippy Fujino and she dates Kakashi? Her real name is Kouseki Fujino and Naruto didn’t know that he had a sister until Kushina saw her? Did she love pancakes (which is how she got her nickname) Do they have massively impossible breasts? If so, the story is called “The fox hidden in the leaves” by MikeJv37. This is extremely rated MA and can be found on fanfiction.net . Mike died a few years back but this story is completed, some are not. He has quite a number of Harem stories so you can check them out to see if one of them is correct.
Also, there is a reunion with Fujino where Kushina first sees her and she calls Fujino “Koosy”
Is the sister nicknamed Flippy Fujino and she dates Kakashi? Her real name is Kouseki Fujino and Naruto didn’t know that he had a sister? Do they have massively impossible breasts? If so, the story is called “The fox hidden in the leaves” by MikeJv37. This is extremely rated MA and can be found on fanfiction.net . Mike died a few years back but this story is completed, some are not. He has quite a number of Harem stories so you can check them out to see if one of them is correct.