Esterly denied the affair, the Morning Call reported.
Police told the Esterlys to leave the Yus' home and never come back.
And a few blocks from Amy's home, police told the Morning Call, Esterly had rented out an apartment that he kept secret from his family. Last month, Esterly and his wife came to Amy's house and got into a shouting match with the teen's mother that was so vitriolic that police were called.
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The woman told authorities that she had dropped her daughter off at the bus stop that morning but that Amy never arrived at school.
She made other troubling discoveries at home: The girl's passport and other personal documents were gone. Esterly had also vanished, along with $4,000 he had withdrawn from his wife's bank account.
Amy's mother told CNN that texts she discovered on her daughter's phone made the teen and Esterly seem like girlfriend and boyfriend.
Esterly and his wife had gotten into a scuffle as she tried to look at Facebook posts on a phone, and police were called.
There was a secret, hidden aspect to the relationship between the teen and the middle-aged man.
Esterly had signed the girl out of school 10 times since November without her family's permission, acts made easier by the fact that she had listed him as her stepfather on emergency-contact forms, according to CNN.
The disappearing acts got so bad that, at one point, Esterly was prohibited from being on the grounds of Lehigh Valley Academy Regional Charter School.
Amy's mother, Miu Luu, confronted Esterly about the pickups, the Morning Call reported, but he called them "lies and speculation." But worse was happening in secret, family members and authorities believe.
They "could possibly be traveling together in a 1999 red Honda Accord" with a Pennsylvania license plate.