According to the commentary, the context is that Byleth is wearing this t-shirt on their date. It definitely explains Edelgard's fancy-looking dress and expression lol
^ Agree. If Maki wasn't the one hugging her, I might have mistaken Nico for an imposter. Nico without long sleeves when she's not performing is just so usual..
^What? No, they just hang out all the time together, eat fancy meals together, end up in bed naked together...what about that makes you think of dating?
Yes, a vast majority of Nanaka x Hazuki shippers play up the NTR angle on purpose... plus I personally don't have any interest in poly ships, it is part of me being a monogamous person by nature, my ideal life is monogamous, thus so are my ideal ships.