I veto Aidori, sorry. Aido isn't a couple type, too much of a flirt and they don't have much in common. Plus, Yori said she was interested in day class guys, night class was scary in her eyes.
You're right. Yori Wakaba would definitely not "fall" for a NightClass guy,but rather stay in her comfort zone the DayClass. I think she has the hots for Zero Kiryu. That's my opinion.