"Hahi! I thought it was supposed to be Defense Against Dark Arts?" Haru's voice cut through the classroom.
Ayame nodded. "Yes, normally that would be the case. Except I have found out that Hogwarts doesn't offer a Defense Against Light Arts class and it would be failure on my part if I didn't teach you both."
"Wait, wait!" Ron asked. "Why would we need to learn defense against light arts for?"
Ayame stopped to consider the seriousness of the question. It was entirely possible they were trying to haze her as she was a new teacher, but… no judging from the confused look on everyone's faces but her kids, it was indeed a serious question.
"Because even Light Arts can be dangerous," Ayame said firmly.
"But it's Light!" Ron protested.
Patience, Ayame reminded herself. It was not these kids' fault that the culture they grow up in was largely ignorant to the rest of the way of the supernatural world viewed things. (She will however, forgive their faulty assumption because even back home there were plenty of people who held similar thoughts. They, however, at least acknowledged the potential dangers.)
"You appear to be making a faulty assumption," Ayame said. "Just because something is Dark does not mean it is Evil. Likewise, just because something is Light does not mean it is Good. Light and Dark simply are."
Oh dear. Her students looked very confused (her kids however do not). Well, the Gryffindors appear to be confused, the Slytherins were looking at her with various degrees of wariness. This was such a bad idea.
Quietly, Ayame asked, "I'm sure you're all familiar with the three Unforgivables. What is the characteristic of the killing curse?"
Silence.
"The green light," Tsuna said softly.
Ayame nodded. It was no surprise that Tsuna remembered that spell. It dealt with light after all. "Avada Kedavra, the killing curse," Ayame said. "That green light, by the standard classification, is a Light Spell."
Her class broke out in uproar.
"Enough!" Ayame roared, breaking through the shouting. Her class quieted. "I assume all of you know the Aqua Eructo spell?" she asked.
The class nodded. In the back, Ayame noticed that Takeshi was grinning. Silly boy. Given his temperament, he had the Aqua Eructo spell down with ease. It was one of his favorite to learn.
"It's a useful spell isn't it?" Ayame asked. "By the same standard classification, it is a Dark Spell."
More uproar. Or rather the Gryffindors were making a fuss, the Slytherins were looking different degrees of alarms and surprise and her kids looked amused.
"How is it considered to be a Dark Spell?" Lavender Brown shrieked.
"That is a good question," Ayame said. "How many of you are familiar with the concept of Yin and Yang?"
Silence again.
Well, this did not bold well.
Light does not equal good. Dark does not equal evil.
Aqua Eructo is spell according to the HP wiki is learned during late 4th year and is only found in the games. Would have used Aguamenti but it's not taught until 6th year.
Read chapter 19 of We Weren't Born to Follow for why Tsuna and light go hand in hand.
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