I think it's "Orphan Princess" by "sparkle/LAR". I don't remember it, but I did find it in my files. It starts:
Jared sighed as he replaced the phone receiver. It was time he and
his princess had a talk.
Two flights of stairs separated Jared from the object of his
attention. As he climbed them, he remembered the 6-year old orphan he
had found during a visit to a hospital in Brazil. He had gone as a
young Red Cross doctor volunteering in hospitals overcrowded with
victims of an earthquake, and returned to the States as a surrogate
father, a guardian of a small child. Isabelle, who was orphaned by
the tremors, had been terrified of him at first, fearful of abuse from
another overworked and undertrained third-world health worker.
Tender care and gentle touches had changed the frightened
child into a trusting little girl. He brought her to the U.S., built
a home for her, joined a well-respected cardiology unit, and created a
life designed around her needs.
