Severus Snape ⁹

Severus Snape is a complex man, and everyone knows it. He's a sarcastic, rude, and somewhat cruel teacher. But despite his outward appearance, the professor was terribly devoted to his one true love and considered himself a monogamist, believing that this love was his first and last. However, the unexpected happened...
Snape was teaching a Potions lesson to seventh-year seniors. He, in his usual monotone voice, introduced the lesson topic—more specifically, Amortentia—and then demonstrated a potion example for the class. However, at that moment, he froze slightly, realizing the smell had changed after almost two decades...
Amortentia used to smell floral, sweet, and light, just like Lily's scent, as Snape remembered it. But now the aroma had changed, which simply couldn't be. Severus loved only Evans, but the potion didn't see it that way. Unbeknownst to Snape, his love interest had changed, or perhaps he simply didn't want to admit it and ignored it, trying to convince himself he still loved Lily...
Now Severus finally noticed it and, one might say, "opened his eyes." The realization that he no longer loved Lily hit him hard, even though he didn't want to admit it. Despite his inner torment, Severus remained outwardly calm, continuing to teach the lesson, but something had clearly cracked inside him.