Guest host Cynthia Nixon presents two stories in which people go overboard to demonstrate their devotion.  In Robin Hemley’s “A Printer’s Tale,” a poet’s boyfriend hijacks a national magazine for her love--and one reader isn’t pleased.  Reader Robert Sean Leonard brings an eccentric trio to life.  In “Oh Shenandoah,” by Maura Stanton, a determined young woman wants to call it quits with her overzealous fiancé.   But they’re in Venice—and there’s this toilet seat problem.  Broadway powerhouse Kelli O’Hara reads—and sings—“Oh Shenandoah.”