So what to do? You could leave the ambiguity over their romantic relationships and handle it tastefully or dismantle the relationships between the characters you had climbing over each other in S1 in the most cringeworthy way in S2...
Guess what KyoAni did.
Apparently it's not gay if it happens in high school/college. The series writers do their best to remind us that Reina liked Kumiko for her passion for music and all that handholding and confessions of love were nothing more--in fact she's yandere for widower-sensei and confesses in one of the most cringeworthy moments in recent memory. Think Graduate meets Nabokov for roofie-laced drinks.
Oh and Kumiko isn't playing for the other team, despite checking out Reina in a near lecherous fashion all season 1, then finding herself another girl when she got all stalker-ish. Turns out she just wishes her sister loved her and went looking for that in other girls--yeah that's not creepy.
All the while Shuichi gets treated like the buttmonkey that he is.
There are some genuine WTF characterization moments, as if the writers went 'oh crap' after rewatching S1 and realized they had made a soft yuri anime and had to undo all that in S2 in the most trite way possible.
Oh, and there's a bikini episode, too, because...
I kinda left wishing I had not watched S2 and let things be with S1.
At least no one died or got cancer, so there's that.
