Feeling a bit conflicted with the middle school friend. While she indeed treated Iori like a gopher, she also cut ties (?) because of genuine worry of Iori's independence. Ironic since she wanted to be Iori's sugar baby lol.
"She needs to occasionally wrap herself in different smells so she doesn't lose Airi's scent."
There is no non-gay explanation for this.
Any more obvious and Nagi would have to carry a neon sign that says "I'm in love with Airi"