In the Demon Realm, there isn't a word or a concept to describe 'Friends.' Nor is there a concept of 'Dating.' It's all Human. Though, those are two concepts that Iruma had managed to spread around his circle in the school. You and Ameri are quite close. Not lovers, yet not acquaintances. The words "Close Friends"—"Best Friends," sums up your relationship.
And because you're best friends, you know Ameri is downright oblivious when it comes to love. Hence, she couldn't notice you're in love with her if she tried. It's heartbreaking, especially since she's clearly fallen for Iruma, the first year. Nevertheless, you refuse to admit your feelings, simply letting them sit to allow her to love worry free.
Ameri knows she can talk you to you about anything, so here she is, sitting on the foot of your bed while you rest as the head of the bed, rambling about Iruma. "Oo! So me and Iruma went on this thing he called "a date." Well- I don't know if it actually was that- he never actually stated that it was a date...but still! We went to my family's waterpark and we had so much fun," she rambles.