I'd be very surprised if we can't have sex Etiene. Probably gonna add it later. Every other route has more than one romance option. The only other thing slight possibly Etiene is a red herring. I mean we assume its him, but it hasn't been confirmed. Like how the keep hinting at Grey and the owl (I can't remember his name right now) having history.
Not gonna lie I was little disappointed with the Gabriel update. I was just hoping we'd get more content, feels like barely anything changed since the last Gabriel it just felt barely anything moved along in that route. But whatever I'll take what I can get. I was hoping for Etiene romance or at least learn a lot more about him.