(...) Kovu looked to Simba's body, who lay on the floor.
- Kovu? - Simba raised his head, his voice weak.
- What is it?
- Why... why did you do that? - Simba asked, looking deep into the eyes of Kovu, who failed to secure in his eyes too.
- I did it for Scar... and my mother, Zira... - Kovu sighed.
- Zira is not your real mother.
- How... how so?
- Your real parents are Chumvi and Kula. Both were good friends of mine. When Scar dominated the Pride Lands, they fled when they became teenagers, and one time after, you were born. Your parents were unable to take care of you, and then they found Zira, and she told them to deliver you to her, saying she would take care of you. She killed your parents and ran away with you. - Explained Simba, and Kovu looked at the floor. - I'm sure they would be very upset if they knew what happened.
- Maybe they understood. - Kovu said, coldly.
- Maybe not.
- Whatever. - Kovu turned his back to Simba and walked away, just once more looking back. It was just an impression or he saw a small smile forming on the face of Simba?
My theory.
Kovu and Simba: (c) Disney