It's fine! Arrakis is normally a magical corpse. He's human at the moment because he sacrificed his magic, but still, he's very open minded.

Ooh that's a fun option too! Arrakis is also bi, although he's still getting used to the term since it wasn't a concept back home. It was forbidden to be with another man on his world, but he had a secret lover regardless. He's still a bit secretive about his love for Sheliak though and tends to call him his best friend out of habit.

So that's another direction we can take with the truth telling instead of the magical monster secret. Up to you!