Disclaimer: I don't own The Lord of the Rings, but if anyone would give it to me I would gladly accept it.
Timeline: The story takes place way before the Lord of the Rings. Aragorn has just lost his father and he and his mother are staying now in Imladris. They started staying there just a couple of days ago.
I'm not a native speaker so sorry for my mistakes.
Elrond
Elrond couldn't believe it. A few days ago he had agreed to help Gilraen with taking care of her little son Aragorn. He had put him under his care and given him a new name. Now little Aragorn was known as Estel and no-one in Imladris, except of Elrond himself and the mother of the boy knew who he really was. This was to keep the boy save. The Shadow of the East was growing again and a few weeks ago it had taken the little boy's father's live. After that, Gilraen had come here to find protection and the boy's name was changed to Estel.
And now, not more than a few days later, Elrond was shutting himself in his chambers and praying, that the boy would be elsewhere when he returned.
"Why?", Elrond thought while he tried to bite back his feelings, "why?!"
The question remained unanswered because there was no-one who could give Elrond a proper answer to it.
At this moment, outside the door of Elrond's chambers a little voice could be heard. "Da-da", it said, "da-da?"
Elrond began to slowly walk circles in his room, praying that the little boy would go away before Elrond would loose himself.
"Da-da? Da-da", the little boy began to sob now. Elrond was feeling more and more cold.
"Da-da?"
When the boy spoke this time Elrond was sure that he was crying. The boy was crying for the father he had lost. The boy was crying for Elrond who was looking a little bit similar to the lost father.
The whole last days the little boy had been following Elrond around, calling him "da-da" everytime he wanted something. But Elrond wasn't his father. Elrond couldn't accept being called that way...
"Da-da?"
Before Elrond knew what he was doing, he opened his door and embraced the little boy in front of it.
"It's OK, my little one", he said, "I'm here so don't cry."
The boy's hands hugged Elrond tightly as if Elrond would slip away from him. Big, fad tears were streaming down the little boy's cheeks and vanishing in Elronds long, dark hair.
The old half-elf sighted. Why had he reacted to "da-da"? His own sons where far too old to call him that way and Elrond knew it wouldn't be good when he would start to think of the little men-boy as his own.
"Da-da", the boy said.
"It's ada", Elrond answered, while calling himself stupid to teach this word the little boy, "say ada."
"A-da", the boy pronounced, "a-da, a-da, a-da!"
Elrond sighted again. Why had he done that?! The little boy was not his io-nin! There should be only three beings in this world who were allowed to call him ada and that where his sons and his daughter!
"A-da", the boy happily said, "a-da!"
"Io-nin", Elrond said softly, "it's all right now. I'm here. Your ada will always be here." The boy had captured his heart. Elrond knew it. One moment long he struggled against his feelings, then he gave in. The boy was too sweet. It had little Estel just taken two days to snug in Elrond's heart.
"I have to tell my own children not to come around for the next two decades", Elrond thought, "Estel would gain their hearts as easy as he gained mine. I don't want that my children have to suffer like me when he leaves us again to follow his path."