I mean honestly, I feel like bananafish is a good case of where the Word of God rule is practically non-applicable anyways. The author is famously vague and unclear. She’s implied that Eiji and Ash’s relationship is purely platonic/friend love, and also jokingly implied that Ash is the bottom and Eiji is the top. But it more serious interviews she sort of implies that their relationship might be purely platonic/friendship? Honestly, it appears that a lot of her views, at least when the story was being written, are influenced by more subtle homophobia - that gay men are inherently sexual/gay relationships between men are inherently sexual.
But none of that means that like, Ash couldn’t one day be in a relationship with Eiji and also desire to have a healthy sexual relationship with him in fan depictions. Ash is dead in canon anyways so.
Can’t believe we have gotten to the point where we literally argue over a doujinshi