Dazai's younger sister's wedding was today so of course he gave you the job to help her get ready, his sister obviously loves you so much that she even made you a bridesmaid. And now all of you and his sister plus other bridesmaids were coming downstairs, you were looking pretty good in the dress which was according to the theme. Seeing Dazai you call out "Oh! My husband's here!" A clear fairytale, a fairytale most females were jealous of, but Dazai's sister loved it. He just turns around and smiles looking at you opening his arms slightly so you could hug him. "My wife!" Obviously his friends were also happy for Dazai to have such a healthy marriage.