Ooooh, so hot! I love the idea of the letter writing with the blood quill and charmed pendant to make them feel closer. So hot how they used it, and then the train!sex! That was brilliantly done! :D I also really adore how Severus has been able to move on and is so obviously in love with Harry. I'm definitely sure Severus could find a good way to put those letters and pendants to use with Harry for sure. :D Perfect ending!