Luer has impressed in five matches for the Sky Bet League Two club during his initial month-long stay at the Lamex Stadium.
The 21-year-old has not scored for Stevenage but he set up a superb goal for Byron Harrison in the 1-1 draw at promotion-chasing Oxford at the end of March.
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Hull signed Luer from Ryman Premier side Burgess Hill Town just over a year ago. He made two appearances for his parent club earlier this season in the Capital One Cup, scoring on each occasion against Accrington and Rochdale.
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