Slash about Harry and Draco, who are enemies in canon, complicates academic theories of slash that are predicated upon the Kirk/Spock “buddyslash” model.
Although the pairing of Harry and Ron may seem as a typical example of buddyslash, one has to consider the presence of Hermione Granger as Harry's second sidekick.
2011, Catherine Tosenberger, "Homosexuality at the Online Hogwarts: Harry Potter Slash Fanfiction", in Over the Rainbow: Queer Children's and Young Adult Literature (eds. Michelle Ann Abate & Kenneth B. Kidd), →ISBN, page 339:
For example, the buddyslash pairing Remus/Sirius can never, post-Order of the Phoenix, fit unproblematically within the discourse of the genre romance, as their relationship trajectory in the books is one of mistrust, betrayal, despair, and Sirius's senseless and preventable death.