The initial Titan. Eren X Fem Reader

Ymir fritz was known as the founding titan but only few knew of the Initial titan. Even before Ymir there was a Titan that walked the earth but was unkown to every being.

What if that titan would also shift into a human.
And started a family and passed down the Initial Titan to each generation. But one year the one who possessed the Inital titan crossed a very large wall and was found by a scout.

She led her family to the walls and snuck in. They decided they would become part of this civilisation and have kept the Titan secret for many many years.