These two always felt like an Akuma No Riddle pairing to me. You are shown them as gals being pals (with lots of hinting), a "platonic" kiss, and one/or both being confirmed "not-straight," then ending with them comfortable in their current dynamic; to the point they don't confirm or take anything about their relationship seriously when the show ends, even though they are essentially married. Yet, we all know they are getting all lewd - with hanky panky fuzzy bumpy, hand-holding, cuddles and shet - after the credits roll!