Post war Harry finds himself devoid of any goal. To know what he should do now he goes to room of requirement and through vanishing cabinet he descends to past. de-aged and lost Harry finds himself in front Wool's Orphanage in the summer of 1941. That is why its said think what you ask for. you might get exactly that.

When an unexpected guest arrived on a new year's eve in a certain orphanage nobody expected that arrival could be birthday give for one of the resident. If life permits

The boy and The dark lord welcomes the new members of family. But not everything is right. But that's not unexpected with them.