Heat
WARNING: This story suggests very deep misogynistic and misandric views that are hurtful to trans people, as well as depictions of racism and xenophobia. Do not read nor interact if any of these triggers you.
Heat tremors are usually indicators of an upcoming Heat, a time for omegas to be fertile, extremely hot, and well... horny. The only way to stop them is suppressants, which any known omega will take, but only at a limited amount of time.
Akko, a beta-disguised omega, faces the consequences of her heat suppressants when she felt odd tremors quaking her being. Now feeling extra-cautious of alphas, she begins to hide from people since... Luna Nova is pretty much an asswipe school. Diana, being the de facto Alpha of the school as well as Akko's good friend, picks up on this, and starts playing Sherlock when she catches another strange scent in the air...