The description video: https://www.youtube.com/watch?v=YdmWt6sjq_I You can marry Serana after completing the quest "Kindred Judgment". This's a simple mod. The mod just adds Serana to the vanilla marriage options. It's the same way that you marry another marriable NPC.
Requirements
This mod does not have any known dependencies other than the base game.
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:: Installation :: You can install this mod anytime. A new game isn't required. The load order is wherever you like. This mod won't be affected by the load order, I think. But if this mod doesn't work, load it at the end of the load order list. Please remember to complete the quest "Kindred Judgment" before you marry her.