I Know You Will

My offering for the 2014 Cobert Holiday Fanfic Exchange. My word was curtain. Also, so sorry that it's late. Takes place around Christmas in 1924. Title is stolen from Lana Del Rey's Young and Beautiful. Also, since I started this before I saw the Christmas Special, there is no mention of Robert's ulcer. I don't think there's any spoilers. My word was curtain.