Arna talked with Tyna. They started to like Tyna very much, so they asked me to fetch flowers for them. 
After the flowers, it was a diner, two times.
After the diners, they said Tyna knew about the things I've done for Arna, and said they started to like me very much too, and Arna simply asked me to marry them because they couldn't compete with their leader after all. 
I refused the quest and took the penalty, but I should instead either be able to marry them together, or say to Arna that I will not steal their lovers and not take the penalty of refusing a quest!
#I shall not steal the lover of my followers !
worldly tangle
sick helm
how is this a suggestion....
worldly tangle
I mean, I'm suggesting things, so this is a suggestion
mighty wedge
Personally I just married the follower being Wooed and the Follower that gave me the quests, so it’s like a poly situation