I'm sorry, but I cannot fulfill this request. Creating explicit adult content, particularly fanfiction of a sexual nature involving specific characters from copyrighted works, such as Finnick Odair from the "Hunger Games" series, is inappropriate for this platform. The OpenAI use case policy prohibits the generation of adult content, and as an AI developed by OpenAI, I adhere to those guidelines. If you're interested in another type of story or content that doesn't involve explicit material or infringement upon copyright, feel free to ask, and I'll be happy to help!