Shoot for the Moon, if you happen to miss, Shoot for the Stars instead.
-Neil Armstrong

The class was silent as they took in their new teacher and all her beauty. The first thing they noticed besides the obvious, was the fact that she was tall, her height without any shoes is an even seven and a half  foot. Normally keeping her feet unclothed as is helped her walk more comfortably. Her large ears add about six inches to her height but she never counts them. Her six large tails are around seven feet long, her whole body was covered in scar-like markings that made her even more beautiful. Everyone thought that she was very pretty.

The whole class was in awe just looking at her. Many of the girls wanted to feel her fur, while some of the guys were wondering if her shirt could hold her overly large chest in all day. Mineta started wondering what her cup size was. Deku started being Deku and mumbling about what her power might be and her appearance. Sirius just smiled as she was used to it all.

"Hello, thank you for welcoming me into your class. My name is Sirius Huli jing. But please call me Sirius and yes, my maiden name translates to Fox Spirit in Chinese as that is where my bloodline originated from. But I was raised in America and know only some Chinese, mainly from take-out menus," the students laughed at her joke. "I hope that we can get along while I teach here. As many of my other students in the past have told me, the classroom is my area of expertise and teaching is my weapon. So I am here to teach you to become even strong heroes than the previous generation, but to also be your friend if you need one. That being said," her eyes and voice seemed to change. Going from gentle and sweet, too powerful and almost feral. It caught everyone's attention, all focus was on her.

"Don't mistake my kindness for weakness. If I truly wanted to, I could send all of you to the next life." Her hair started glowing this ominous purple color and her eyes glowed even brighter. She honestly looks like a Spirit searching for its next hunt. And just as quickly as it appeared it disappeared even faster. "Are there any questions?" Her eyes returned to the gentleness of before and without missing a beat, Deku raised his hand very quickly.

"What's your quirk? How are you so tall? What does the name Sirius mean, since it's not Chinese? And how strong are.." The boy to his right put tape over his mouth.

"Dang Deku, you got to slow down man," he said with a smile.

"Oh sorry," Deku rubbed his head.

"It's okay. My height is due to my parents, being as they both have beast quirks, both are pretty tall. Even with that being the case, I'm taller than they are. My name is Sirius because my father is an astrologist and convinced my mother to name me after a star. Sirius A to be more exact, it's larger than the Earth's sun. It makes sense because I would later gain a very bright personality. As for my quirk, that is something I shall not discuss. It is something that will remain with me. So please don't ask again," Deku nodded his head in understanding.

"Now if introductions are over, let's begin," Aizawa said as he stood up. "Let's start with a simple training lesson. Sirius, if you wouldn't mind changing into one of the school outfits for this. You can give the students a little test run. See where they stand against you," she smiled as the whole class left to change into their training gear.

Everyone arrived at the USJ, they were waiting for Sirius she was having some trouble with finding something to fit her size.

"Sorry if I took too long. I had to put on something I brought with me since nothing else fit."

(Only two pieces would fit her)

It was simple but worked. Once again, Mineta was wondering how big her breasts were, he started drooling. Aizawa explained that for her to get a grip of where everyone is with their quirk, they needed to give a demonstration of how their quirks work. One by one, everyone showed off their abilities while Sirius watched. Analyzing each one of them as they go along. She was ultra-focused on everyone, and while she was analyzing them, Aizawa was analyzing her.

He took in all of her features, her six tails, her long ears, and her body shape. Even he was having trouble figuring out what her quirk might be or if she had one at all. Her form itself might very well be her quirk, but the way she dismissed Deku's question told him that there was more to her than what she was leading on. Perhaps she was hiding something, something that might've scared the students. From what Aizawa heard she was a teacher in America, so she knew exactly how to speak to the students. She was hiding something. He would probably have to talk to Nezu about it, see if he knew anything. She continued to watch the students until everyone had finished, she simply stood up and walked over to Deku, beginning with him.

"Your quirk is amazing and powerful, but it's extremely dangerous and I can already tell that your body has received much damage from it. We'll need to work on strengthening your body that way you'll be more adjusted to your quirk, we'll also need to possibly change your diet. You may need more protein to help strengthen your body against breaking, I also wanna see you strengthening your bones. Don't want you to be sent to the infirmary for a broken body." Everyone was thinking the same thing.
"Too late."

She then turned to Bakugo. Her eyes looked into his as it seemed she was trying to find the words.
"Strong and intelligent, you're able to make split-second decisions on a whim. But you're also violent and you rush headfirst without really thinking about what to do next. At least, what to do that doesn't involve blasting your opponents to the moon," everyone held in their giggles. "If you do this anymore then your quirk is going to tear your body apart, starting with your hands, and don't think that it will stop there. We need to strengthen your mind and your core. You're tough and strong, but brute strength can only go so far before it's you, that you're hurting instead of your enemy."

One by one she gave assessments to every student, speaking of their flaws and their strengths, including areas they need to work on. She approached them in such a gentle yet professional way, one that showed the students she was respecting them and their skills. Aizawa was very impressed with how the students responded to her. Even Bakugo considered her words, listening to her. Afterward, they were sent back, changing into their school uniforms getting ready for their next class. Sirius seemed to vanish after that, no one could find her until after lunch. She was on the other side of the campus, where she didn't belong. Admitting that she got lost. The girls were kind enough to make her a map of the campus. She was very grateful. Aizawa could see the students already getting used to her but she wasn't going to go easy on them. Everyone knew that, they could feel it. Behind that gentle smile and calm aura is a dangerous and deadly creature that could take them out without breaking a sweat. She was a new obstacle for them to overcome before they can be the next great heroes.