HP: She married Malfoy after becoming an exchange student.

A thin mist covered the glass windows of Greenhouse No. 3, filtering the afternoon sunlight into a hazy golden-green hue.

Professor Sprout stood before the wooden crate, her sleeves rolled up, fresh dirt clinging to her dragon-skin gloves. "Today we're going to learn how to handle the guardian tree frogs," she announced cheerfully, pulling a small, bright green creature from the crate. "Their skin mucus is a key ingredient in healing potions."

The guardian tree frog lay quietly in her palm, its amber eyes unblinking. Hermione immediately raised her hand: "Professor, it looks a lot like a vixen larva. How can we tell the difference?"

"Excellent observation, Miss Granger!" Sprout conjured a copper wire cage inside, where several small, bluish-green creatures were crawling restlessly. "The vixen larvae have six legs, and..."

Ron muttered to Harry, "They all look like biting things."

Harry remained motionless.

Ron: ? ? ?

"Mr. Weasley?" Sprout suddenly called on him, "Please repeat the security details I just mentioned."

Ron sprang to his feet instantly: "Uh...don't use metal tools?"

"Wrong, it's not about touching it directly with your fingers." Draco's voice drifted from the Slytherin side. "Weasley, would you like to borrow my notebook? Of course, that's only if you can read."

Pansy, always eager for drama, chimed in, "No way! You'd be better off lending it to me than to Weasley!"

Elias shook his head slightly, helpless against them.

After the explanation, the young wizards began their experiments.

When the wicker basket containing the tree frog was passed to Ron, his frog suddenly slipped through his fingers and "plop" jumped into Neville's bronze mortar.

"Oh no, mine is gone!" Ron frantically searched for his basket, when suddenly his eyes lit up—in the damp moss, a small, greenish-blue creature was curled up.

Harry frowned. "Wait, that looks like..."

But Ron had already grabbed it and tossed it into his silver mortar. Just as he raised the pestle, the "tree frog" suddenly unfurled its transparent wings, and all six legs simultaneously straightened—

"boom!"

Purple smoke exploded with a biting chill, Ron's eyebrows instantly frosted over, Seamus's cauldron was overturned by the shockwave, and the pus from Babo tubers splattered all over Parvati.

"Ron Weasley!!! Vixen larvae release a chilling toxin upon contact with metal!"

Professor Sprout waved his wand, and a warm yellow barrier instantly enveloped the entire class. "Everyone, back off!"

Draco's voice rang out: "Merlin's beard, Weasley, is that a potato on your neck?"

Ron ran away covering his head, yelling, "Aaaaaah, I didn't know!!!" Damn horse manure, adding insult to injury at a time like this!

Draco: ψ(｀∇´)ψ ！ ！ ！

And so a conflict began:

"You idiot!!!"

"Horse manure!!!"

Elias really didn't want to listen to this childish argument, so he simply grabbed Draco, who was swaying back and forth in anger, and cast a warming spell on him.

Meanwhile, the disaster continues.

Neville's toad, Lef, suddenly swelled to twice its size and jumped in terror onto Sprout's hat; Dean's robes froze solid, making a clattering sound as he walked. Worst of all was Seamus—the swelling potion brewing in his cauldron had reacted with the icy toxins and was now bubbling pink bubbles like a fountain.

"Clean it up!" Sprout waved his wand repeatedly, but the bubbles only paused for a moment before starting to grow rapidly again. "This is bad, everyone evacuate immediately!"

The students screamed and surged towards the door. Draco, however, went against the flow, pointing his wand at Ron's frozen sleeve: "Blazing Flames!"

A cluster of blue flames precisely melted the ice layer and then extinguished it in time, without damaging the fabric in the slightest.

"Hmph, Weasley," Draco raised his eyebrows smugly, "you need my help now, are you convinced?"

Ron's face was almost the same color as his hair: "I didn't ask you for anything..."

"Mr. Malfoy reacted swiftly, Slytherin gets five points!" Sprout shouted. "Now everyone, immediately! Get out!"

……

Half an hour later, when the pink bubbles in the greenhouse finally dissipated, Sprout, his face ashen, began to call roll.

"All students who have been exposed to the toxin, go to the school clinic," she said, her gaze lingering on Ron's nose, which was swollen like an eggplant. "Especially you, Mr. Ron Weasley."

Ron tried to explain, "Professor, I really thought..."

"You thought?" Sprout raised his voice unusually. "Page 37 of 'A Thousand Wonderful Herbs and Mushrooms' has an entire chapter on how to distinguish between the two! Besides, I just explained it before class!!!"

Hermione immediately flipped open the book upon hearing this: "Found it! Page 37, the Guardian Tree Frog's pupils are striped, while the Vixen..."

"That's enough, Miss Granger," Sprout waved wearily. "Everyone else pack up the equipment. Slytherin, thanks to Mr. Malfoy's timely assistance, gets another ten points."

Draco bowed gracefully, and as he turned, mouthed to Ron, "Frost Knight."

Seeing Ron's face contort in pain, Harry and Hermione quickly dragged him away from the scene of trouble.

[Small Theater: School Hospital]

Because of the cold poison, Madam Pomfrey applied a thick layer of chili plaster to Ron's nose, and now every sneeze of his produces a few ice crystals.

"At least... achoo... it's not draconis..." Big-nosed Ron consoled himself.