"And do you tell her she’s the most beautiful girl you’ve ever seen?
An eternal love bullshit you know you’ll never mean,
Remember when I believed you meant it when you said it first to me?
And now I’m picking her apart,
Like cutting her down will make you miss my wretched heart,
But she’s beautiful,
She looks kind,
She probably gives you butterflies,
I hope you’re happy, but not like how you were with me,
I’m selfish, I know, I can’t let you go,
So find someone great, but don’t find no one better,
I hope you’re happy, I wish you all the best, really,
Say you love her, baby, just not like you loved me,
And think of me fondly when you hand’s around her,
I hope you’re happy, but don’t be happier,”
https://www.youtube.com/watch?v=VvRt_f8SX0A

It's almost like it's the first time you realized they were a thing Emi...yes, that was the idea, first time she's seeing them together/showing blunt affection for each other, she might have not even known Lyna existed up until now, much less that she and Aizawa were together
No, Emi and Aizawa have never been together, I just had to use this song because of the butterflies line, they may have been closer than they are now, but I don't like them together (I mean, I don't really like any other Aizawa ships, but I specifically do not like that one)

Lyna is dispersing her wings, she landed and right away wrapped herself around Aizawa, so her wings are returning to normal light, just floating away in sparkles

"Happier"-Olivia Rodrigo
Aizawa/Eraserhead and Emi/Miss Joke-Boku no Hero Academia
Lyna-Me