That's for almost all the women in book 2 Right now this is testing process mc will need to really do a lot of work so he can marry them all otherwise if he gets one wife ,many simply won't be with mc officially at all and even move on eventually with political marriages with others.
So yeah book 2 will have whole quests around managing that getting permission to marry multiple people and then everything else fail and you are left with almost nothing , getting your a*s beat,to doing everything right and you have married them all so stat checks, multiple quests for each person then the marriage permission quest itself and a lot of other things.