The Dauphin Francis becomes King

The August 2, 1536, death of the Dauphin Francis made his brother Henry the heir to the throne of France.
Upon the death of his father, Henry assumed the crown on his twenty-eighth birthday, March 31, 1547.
Francis and Henry were the sons of King Francis I of France. Francis I reigned from 1515 to 1547.

Suppose the Dauphin Francis lives. He succeeds as King Francis II.
Who shall he marry?
How does this Francis II change French royal history?
 
François Ier and Henry VIII were on fairly good terms during this period, and the deaths of Catherine of Aragon and Anne Boleyn had rehabilitated Mary Tudor's relationship significantly. With François still living and his two first wives dead, Henry might entertain marrying Mary to the Dauphin - especially once the baby he'd put in Jane's belly turned out to be a boy (who lived!) and Jane died, leaving him free to pursue a French match for himself (Marie de Guise or else Marie de Bourbon). Timing would have to be particularly fortuitous to prevent the passing of the Second Succession Act - or rather, to prevent Mary from being disinherited entirely (after all, since Henry married Catherine in good faith she need not necessarily be disinherited).
 
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