Ariadne wants to fuck Theseus. But when she finds out he's with Nax, it's no more of a big drama than if she'd found out he was with a woman. She has a clear moment of "...oh" and she's cold with him afterwards, but that's clearly as much about the betrayal and setup as it is about her thwarted libido, though that does seem to factor into why she's hurt.

People are just allowed to be gay, without comment or judgement.

And they're also allowed to be trans. There is *no* discussion of Riddy fucking Caeneus, in the context of him being trans. *None.* No hand-wringing about what it means for Riddy's sexuality. Nothing but acceptance of who he is. We are given no more reason to believe Riddy is anything other than straight after they've had sex. (There's no particular confirmation that she's straight either, but then again there usually isn't.)

That's another nice thing - the story doesn't make Caeneus's gender about his partner or her orientation. Caeneus's gender and transition are about *him*.