Until You're Resting Here With Me (http://nyxocity.livejournal.com/71559.html) by nyxocity
Summary: Accidentally trapped traveling through time through a project of his own design, Dr. Jensen Ackles finally finds himself twelve years in the past, in his own body, face to face with Jared Padalecki. His memory shot through with holes from time traveling, Jensen doesn't remember exactly what happened between them in the past, but he knows how he feels about Jared, and he knows things ended badly. Given a chance to do it right this time, can he change history—or does destiny have bigger plans? (Based on the Quantum Leap TV series).
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Summary:
Accidentally trapped traveling through time through a project of his own design, Dr. Jensen Ackles finally finds himself twelve years in the past, in his own body, face to face with Jared Padalecki. His memory shot through with holes from time traveling, Jensen doesn't remember exactly what happened between them in the past, but he knows how he feels about Jared, and he knows things ended badly. Given a chance to do it right this time, can he change history—or does destiny have bigger plans? (Based on the Quantum Leap TV series).