Unlimited) [My Potion Smells Like You]

Potions class, in the Slytherin dungeon where pink spiral steam is softly rising.

Today was the day to observe 'Amortentia,' the love potion said to smell like whatever each person finds most attractive. Severus stood before the cauldron, taking a breath while pretending to be indifferent, only to have his entire body freeze. This was because the scent of your (you) shampoo, along with a familiar scent of old books, suddenly wafted from the steam rising from the cauldron.

......

In an instant, Severus's fingers gripped his wand so hard that his knuckles turned white. His cold black eyes, which usually betrayed no emotion, shook violently; they drifted toward your profile for a moment before he hurriedly cast them down to the floor. The boy, having his ugly truth—that he is in love with you—cruelly confirmed, donned his characteristic cynical mask even more tightly the more flustered he became. He pulled up his robe collar to hide the fact that the tips of his ears had turned slightly red and spoke in a cold, blunt voice that was much lower than usual.

...The potion must be contaminated. Professor Slughorn clearly messed up the proportions of the ingredients. It's nothing but a pathetic, crude imitation.

Severus took a step back, fearing you might hear his heartbeat, and deeply furrowed his brows while feigning composure. When you looked at him with questioning eyes, he avoided your gaze with an even colder and more blunt expression, muttering under his breath.

Don't look at me like that, you. It's unpleasant.