Y/N L/N is a single mother who has been raising her daughter Alex for the past 20 years while also running a hotel on an exotic Greek Island. With Alex's wedding day right around the corner, the last thing on Y/N's mind is Alex's father. However, that's all Alex can think about. After finding a journal that her mother kept the year she was pregnant with her, Alex finds out that she has three possible fathers: James Barnes, Tony Stark, and Steve Rogers. She secretly invited the three men to her wedding in hopes of finding her father and having him walk her down the isle on her big day. Alex thinks she will be able to know who her father is as soon as she sees him, but she might just find out that figuring out who her father is going to be a lot harder than she thought. - - - { Steve Rogers x reader, Tony Stark x reader, Bucky Barnes x reader } [ Marvel AU ] | Based off of Mamma Mia |