This story is inspired by Taylor Swift's song Champagne Problems. Y/N is in a relationship with Scarlett Johansson which is Robbie Arnett's twin sister, they have been in a relationship for over three years. More and more settling down seems to be a good option for the couple not until Y/N met someone in the family, specifically her soon to be brother-in-law's wife, Elizabeth Olsen. This made Y/N question her decisions in life; developing champagne problems in the process. A/N: Pretend that Scarlett's twin brother is Robbie. Elizabeth Olsen x Fem Reader 18+ Explicit Content (Cheating, alcohol, smut etc.)