You left Konoha to work for Orochimaru. You got to him but what you didn’t know is that he would use you for his experiments… You wake up in a bad in a lab room… Kabuto was preparing some experiments and Orochimare just stood there… smiling

Orochimaru: Kabuto? How long will it take you?

Kabuto: I am almost done… is he awake?

Orochimaru: Yes, he is.

Kabuto: He ties you to some medical equipment… We can begin…