I enjoyed subbing to cynthia scene. I also enjoyed the little lily scene. I do wonder who will be the first li to want a relationship because it seems like yun just wants to be casual and cynthia is still starting out. Maybe the teacher.
Mom is out, because Flip said so.
Milly barely knows Summer. Maybe they could be friends.
Maxine doesn't want to abuse her position as Summer's boss. Who knows how it will go later, when she gives in.
Rosa will want to keep it casual, I guess.
Lilly is a friend for now. Most likely becomes friend with benefits later.
As you said Cynthia is new to all of this and Yun doesn't want a serious relationship.
I don't remember if Denise said anything about it either. Since they are already having fun together, it doesn't bother her that she's Summer's teacher. But it seems she still wants to keep it under wraps and doesn't want the entire school to know about it.
We don't have enough information about Sam yet.
Looking at the banner, we have Lilly in the middle as Summer's best friend and on the sides are Denise and Maxine.
We'll see if it means anything.
The conclusion could very well be that no one and they all just want to keep it simple.