I'm really hoping that Hinase picks an actual gender at the end of this story, and doesn't become some kind of futanari instead. Ugh. I'd dislike that approach. I would however be super happy with the three of them all dating together as a menage e trois (preferably with Hinase as a girl as well). ^^
Or...2nd best option would be for Hinase to become a girl and still pick Ritsu-chan for a yuri ending <3
3rd best ship would be as Hinase as a female with Shiori. I personally think that Hinase is more feminine than masculine. By a wide margin.