No transmigration. The female lead is Bucky's daughter. She grew up in Hydra, so her moral compass may be a little off.
This is the story of a girl who was duped by Hydra, escaped, and then rescued her dad, while also seducing his best friend.
P.S. 1. There are some original additions to the setting. The plot follows the author's imagination.
2. The author is letting loose.
3. The female lead is very much a Mary Sue. The main storyline is Marvel, with a possible DC side story.
4. Steve Rogers is the love interest.