Prosecutors said Colin Kennedy, 18, used the pretext of being locked out of his own dorm room to gain entrance to the victims' quarters at Fordham Hall, the Chicago Tribune reported.
Both victims knew Kennedy and thought they were doing him a favor by allowing him to sleep in their rooms.
The rapes occurred on consecutive nights in January.
Kennedy, who is from Laguna Beach, Calif., is charged with two counts of criminal sexual assault.
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