Right? At an absolute minimum, I count as reasonable possibilities...

One or more characters are actually imaginary or hallucinations.

The narrator misunderstands something.

The narrator is lying about or deliberately omitting something.

A character is queer.

A character is trans.

A character is [some other surprise marginalized identity].

Someone the protagonist trusts has been secretly manipulating them all along.

The narrator is in a mental hospital or otherwise delusional all along.

The apparent victim is actually the perpetrator.

Probably also "It was all a dream."