Through an .esp and simple bat console commands, it allows you to make literally almost anyone you meet, (essential or non-essential), your follower and or marriagable. It still behaves as the vanilla game intended, a one-time "deal". You choose someone, agree to be married, talk to the priest at the Temple of Mara to arrange the date, wait till dawn the next day, get hitched.
Please Note: If using console commands breaks immersion for you, this mod probably isn't for you.