He had his eyes set on Laura,
He uses his abilities to transform himself into an exact copy of.
He then fabricated documents and identity papers claiming to be her long-lost twin sister.
Using his psychic abilities, he mentally manipulates her to believe his story.
He uses his abilities to convince her not to tell anybody about him.
It would just be their little secret until the time was right to tell everybody.
He gets her to invite him to come and live with her so they can get to know each other better.