I don’t know if this matters and I can’t believe I’m even writing to speculate about incest law, but I’d always inferred that it was intended to be read as an older relative abusing a younger one or child. I don’t really want to know and I definitely don’t want to do the research myself, but is there any legal precedent for two people well into adulthood like this? This is fucked up and vile beyond belief, but it lacks the extreme predatory elements implicitly associated with incest that make it really deeply evil.
This comment doesn’t affect the letter of the law, but it may influence whether the DAs office pursues the case