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In Heroes fandom, Nathan/Peter is known as Petrellicest, which refers exclusively to an incestuous relationship between brothers Nathan and Peter Petrelli. The term does not refer to incestuous relationships between other members of the Petrelli family, such Peter/Claire (which goes by paire), perhaps because Claire was not revealed to be Nathan's daughter until more than halfway through the first season.
- fanfic here -
- Climbing up the Walls by obsessive24, a multi-fandom vid showcasing three fannishly popular incestuous relationships, including Nathan/Peter.