Sango's Deadly Secret

Miroku got a shock to see Sango jumping out of her window. His room was right next to hers, so he could hear everything see did, and see everything she did outside her window.

He watched her go towards the forest next to their house, then he jumped out himself and hid behind a tree, watching Sango's every move.
"So your finally here, hey?"
A creepy voice came from the forest...
"Yes... Master..."
Sango replied.

What?! Miroku thought, master, Master, MASTER!?????!!!!! When the heck did Sango have a master? I thought Inuyasha and I were her masters!

"I saw everything you did, and it was a great act for pretending to do homework,"
The voice came again.
Miroku tried to work out the famailar voice which he'd heard somewhere before...
"Yes master... Thank you master..."
Sango replied, like she knew the guy all her life, and she hadn't seen him for ages!
"Could it be Ryu trying to change his voice so I won't reconzie it?" Miroku thought. "But the voice it way too famailar!"

"Now, it's time to give you your next task..." The voice said.
"Yes master, what is it master?" Sango replied.
"I want you to go and kill that mut!" The person commanded.
"Inuyasha? Yes master..." Sango replied, once again.
"Yes, kill the half-demon Inuyasha!"
"I shall go now..." Sango replied...
ARHHHHHHHHHHH!!!!!!!!!!!!! Miroku shouted in his mind. "Sango's gonna kill Inuyasha!!!!!!!!"
Sango heard the voice in her head and turned towards his dirction.
"Oh damn! Time to run!" Miroku said already running away, but he was no match for Sango, she caught right up to him in no time!
Miroku manged to get away from Sango, but she alwayed caught up. "What is wrong with you Sango?! You can't kill Inuyasha!" Miroku shouted while running away.

Sango looked at him, sharply. Sango has red eyes!!!!! Miroku realised, but what does this mean? I have to find out!