In The Voyage of the Dawn Treader (I haven't seen the movie version but I know what happens in the book),
Caspian falls in love with Ramandu's daughter and after the journey ended, she becomes his queen. I know Suspian shippers and Caspian fangirls will be enraged.
First of all there were NEVER EVER EVER hints of romance between Caspian and Susan in the books, is was just added in the movie and in the books they barely interacted. (the kiss Susan and Caspian shared at the end of Prince Caspian, IT WAS FANSERVICE!)
Susan herself said that between her and Caspian wouldn't not ever worked since she´s chronologically in Narnian years 1300 years older than Caspian and since she was an adult in Narnia she and Peter will not return to Narnia again cause they are older and they have to be adults in the real world.
And part of the plot of The Silver Chair happens because of Lilliandil and her son Rillian are involved!
Prince Caspian, Lilliandil-C.S. Lewis