Their Daughter

A/N (author's note)

This is the era of when the founders of Hogwarts were still ruling Hogwarts.
Summary: Salazar Slytherin had a daughter with his soulmate/mate Goddrick Gryffindor. They named her Celestial Legacy Slytherin Gryffindor. The founders are still alive but hiding in their animagus forms Slytherin a snake, Hufflepuff a bagger, Ravenclaw an Eagle and Gryffindor a lion. Every time Slytherin's daughter died, she began a new life but as someone different so she met the maruaders and was killed in 5th year then she was reborn as Ashley Rose Clearwater the little sister of Penelope Clearwater and Harry has siblings and James and Lily are not dead and Harry's twin brother Jeffery is the boy who lived even though Harry was hit with the killing curse and Harry is friends with Ashley but he thinks that she's very annoying and regrets being her friend and Ashley's boyfriend cheated on her and then she overhears Harry speaking Parsletounge to Salazar and she never forgot the past and she finds out that the founders adopted Harry and that they forgot about their favorite student and family member and she runs to the forbidden forest and calls the dark lord with the mark he gave her in case she needed to talk to him and she wants to be a death eater and she doesn't have the real dark mark yet and she tells the dark lord Harry wants to join their side and she's not happy about it even though she hides it very well and the Clearwater family don't know she's on the dark side.
Also the picture above is what Ashley looks like now but she can change her appearance at will so her looks will change in the future.