A baka's luck

What if instead of Akihisa's sister never showing up but insted another person shows up,and she so happens to be Akihisa's fiance and she decided to move in with him.How will his life be now,how will his friends react to all this except for one of his friends.How will he continue his life and what and what troubles may come his is may be a rated T or M story,well have to wait