As far as I know it's still just Suu who has a crush. The other two just got interested because they wanted to see who their sister fell for and now at least one of them sees it as a challenge to get some emotions out of her
I just wanted to say I absolutely adore these TL notes and I'm learning a lot of cool info from them even though I considered myself a huge weeb already :3
And hey, finally Suu got her time to shine!