The forgotten twin of Haruno

Teacher?

I was heading back from a mission. Well, more like my teammate was carrying me. "There are only two more kilometers left to Konoha. Do you think you can stay awake Ryo ?"
Rin asked me." Yes... " I said in a monotone voice but he knew I was in pain. Rin is also an anbu black oop. We have been together ever since our training started which was six years ago. He has brown hair and brown eyes with a hint of yellow. He is a good 4 inches taller than me but he is thirteen so it's understandable. We rushed through the hospital door. The nurses took me away but he followed, holding my hand. "We are here" was the last thing before I blacked out.
Rin's POV
When the nurses took Ryo away I went to Danzo. I had to report our mission. Of course I was worried about Ryo but if I stayed with her or showed even a slightest emotion towards her we would have to do the final exam. We were emotionless from the start so Danzo though it would be fine if we were put in a team with each other. It seems like only the two of us know about our emotions. No one else has seen them and never will. That's our promise. I arrived at the door and knocked. "Come in." said an old voice. "Mr. Danzo." I said and bowed. "Start report Shadow. Where is Phantom." " The mission was successful, here is the scroll. Phantom was injured while fighting Orochimaru. Her right eye was sliced. The doctors said she won't be able to see with it." Danzo didn't look happy about it. "Well. From now on she will be a help for Copy Ninja Kakashi. You will continue your job as an anbu. Go." said Danzo. Once again I bowed and went to check on Ryo as she is now safe. But who will she teach?