[Mandalore93]

In the very specific mechanisms of the book, Littlefinger has very little reason to rape/rape marry Sansa. Within the medieval and even Renaissance it was very common to wife up your captive womenz pretty much instantly. One of the latest ones I can think of was King Gustav of Sweden before the Thirty Years Wars fucking up the Electorate of Brandenburg then fucking that guy's daughter after capturing her.

Edit: I think that with the way the plot narrative is going that it's very obvious that the Starks will unfortunately make a come back from their lackluster performance and Petyr will be sacrificed for the narrative. Very unfortunate. Realistically, a player of Petyr's skill would dangle Sansa infront of the Vale for as long as possible before marrying her himself. He would lose control of her (and the North) if she is married to Harry the heir.