I have also incorporated elements of the spontaneous telepathy that can occur between close friends and relatives.
In my stories, it can only occur between two people who love each other and are in harmony.It is initiated by touching foreheads together, but once a close bond is formed, contact is not always needed to share a telepathic link.
The idea came to me from reading about the Numenorian and Elven enhanced mental abilities .
When Aragorn heals Faramir, he has his hand on his head,as if attempting to somehow communicate with him.
Now Aragorn knelt beside Faramir, and held a hand upon his brow. And those that watched felt that some great struggle was going on. For Aragorn’s face grew grey with weariness; and ever and anon he called the name of Faramir, but each time more faintly to their hearing, as if Aragorn himself was removed from them, and walked afar in some dark vale, calling for one that was lost.
Arwen is able to watch over Aragorn from afar in thought.
Arwen remained in Rivendell, and when Aragorn was abroad, from afar she watched over him in thought;