I've read on sites that you can make your spouse into a vampire, and the quest to achieve it becomes available after you've done a few quests for the Volkihar vampires. Well, I've done quite a few quests. I received the mission to seduce the woman in Markarth twice (had to kill her the second time to "fail" the quest and get a new one) I've also wiped out the dawnguard leaders. But still nothing mentioned about me vampirizing my spouse. What were other people's experiences with this quest? Feran Sadri has just given me a quest to kill someone in Raven Rock, and I haven't even started the Dragonborn quest with this character yet, so that's pretty ridiculous.