**EDIT, 10:22AM, 11/19/2017**
After completeting all required steps, I noticed the marriage quest was a bit... broken, at first. I spoke to Renamon about marrying me, then spoke to Maramal in Riften to arrange the wedding. He responded as he is supposed to, but I kept reentering the temple to try to trigger the wedding. Make sure you still have Renamon as your follower, and exit the temple of Mara. Wait outside the doors for 24 hours, and the next step will properly trigger: 'Your follower leaves for your wedding.'
From there, everything will go as normal.


Initially she cannot be married, but with a simple console command, that can be changed. Follow these steps:

1) Open up the console with '~' on the keyboard (usually it's the key right below ESC.)

2) Click on Renamon and her reference id will come up.

3) type in 'addtofaction 19809 1'

Note that you also have to be wearing an amulet of Mara to have the 'Interested in me, are you?' dialogue option come up.
If you want her to still be able to follow you and fight, you'll need to set her aggression and confidence levels.

4) Repeat 1 and 2

5) type in 'setav aggression 1'

6) type in 'setav confidence 3'

If you haven't already, you can choose to set her to essential, meaning she won't die.

7) Repeat 1

8) de-select Renamon by clicking away from her then clicking again to clear the reference ID display

9) Type in 'help Renamon'. This will give you her NPC ID

10) Type in 'setessential <her NPC ID> 1

If you want to increase her level, if she isn't already levelling with you, repeat 1 and 2, and type in 'setlevel <insert desired level>

Hope you all found this information useful. Have fun.