How to get back my sis

Has anyone had a past relationship with sis that was interrupted for a while, and then resumed normal relations? What's the solution? How can I take the step and bring back the past?
Im 27m shes 24f
We used to do some things before 6-7 year daily and weekly but we stopped suddenly. I left my country for 4 years and now i came back.
3 years shes not living my mind. And now since i came back im addicted to her and idk how to get her.
Sorry for my entlish im muslim arab. And im sure a lots of Arabs have incest relations