Well then, its time to practice his power!

Though exactly how he is going to practice his Sacred Gear left him thinking overdrive. Is it just a simple "write my name, and I will own it,"? Or is there some specific application, what are its other effects including the social ones. Can he pass it along to someone else by writing their name? How far does his ownership actually goes? Could he own people's minds? Also, what about stamps? Does that qualify as writing his name?

Issei walk toward class with his sudden high thinking skill(when it comes to boobs of course). He is going to need some "volunteers" for this, and he knows where to start first.

Class started as students enter the classroom, Issei sits on his chair where it's near a window and a wall, which is extremely convenient for what he is about to do.

"Yo Issei, where were you," Matsuda asked, who is already sitting on his chair

"Oh, me? Just walking around" Issei lied, Matsuda and Motohama are his old friend, they all decide to transfer in this school due to the ratio of females. Although they are his only friends in this school, he would like to keep his power for himself for now, so who knows, maybe he would give these two some privilege if he feels like it.

The teacher came in and began her teaching.

"Now then, we shall start with our lesson-"

"Excuse me," Hyoudou called, all eyes are on him for the sudden interruption.

"Yes Hyoudou-san?" The teacher responds, wondering why one of her more perverted students is raising his hand.

"Look at this," Issei shown him the wall with the name he had written on it with a pencil, and instantly the teacher expression change to realization and even dreaded, the class has the same one.

"I-I apologize Hyoudou, I didn't realize you own this room," she frantically said, the other student's whispers among themselves as they don't know what to make of him being the owner of this classroom.

"Yes, so even with a pencil it works." Issei thought, this would be easier if he doesn't want control and erase his name, but that might be the main issue first.

"It's fine, just a reminder," Issei stated, glad that his control is still there.

"Pardon for my rudeness Hyoudo-san. Can we use your room for our lessons?" The teacher asks.

"Sure, I don't mind. Though I would be the ones adding any rule if I feel like it," Issei said, and the female students grumble at that, none spoke since it is his classroom, the teacher thank him for it.

"That's understandable, thank you for your kindness Issei," She thanks.

"Oohh, So Hyoudou owns this place~" One of the female students with glass said, this is Aika Kiryuu, she is actually known to be a pervert herself, basically a female version of his friend Motohama, though maybe not as much as the three of them are, though she does give the boys chills when she looked at their lower half.

"Now for my practice," Issei thought as he start with his schemes.

"Actually, I have a new rule to add to my classroom," Issei stated, and instantly the teacher and students look at him again.

"O-oh? What is it then Hyoudo-san,"

"Every female student have to be topless until the end of class." The girls instantly blush in embarrassment at the rule they had just heard, while the boys cheer in anticipation of been able to see some tits. Katase and Murayama, the two kendo girls that usually beat him up(when he was peeping), glare at him with a red face, but still follow his orders as this is his property and his rules.

Each and every one of the girl removes their school shirts, green, blue, red and purple and even a combination of colorful bras shown reveal to the male as they put all their gaze on their desire boobs.

Then, its time for the final,

"Nooo!"

"This can't be happening!"

"Why do we have to follow this rule!"

They all whine, but still follow the rules, thus a glimps of their naked breast can be seen.

"woooaaahhh!' the boys cheered loudly that they manage to see such a glorious view, a few of them called Issei a god among men.

From small to big, and even the two kendo girls, they blush full scarlet as the try to cover their breast and nipples from being seen by the lustful male.

"Nice Issei!" Motohama said.

"I would forever worship you Issei, my man!" Matsuda also cheered.

Good, he owns this classroom, he stares at the girls boobs and chest, truly it is heaven(thought maybe third floor), but this doesn't really teach him anything then what already happens in the student council room(well he could still have a look).

Now then, for the main reason why he chose to use a pencil, he knows that any other type of writing tool would work as he remembers the whiteboard, He grabs his eraser, he rubs the name off on the wall and sees what would transpire.

Nothing, they simply go on with their lesson, though the boys are oogling at the girls while the girls still show the look of embarrassment at their topless state, they didn't put on their bras or shirt and are just continuing listening to the lessons while covering their breast with one arm.

"So their just going to continue following the rules I gave them?"

"Hey Matsuda," Issei asked his fellow pervert friend.

"Yeah bro?" He responds, his eyes still on the half-naked girls.

"Who owns this classroom?"

"Eh? What's with that question? The principal of course, though you did own it before and order the girls to remove their shirts, sweet move, I owe you a debt there." Matsuda grin, "Why you ask?"

"Nah, just a stupid question," Issei responds.

"So that's it, he still remembers how I owned this place, but still act like its normal," Issei made his hypothesis, he most likely cannot add anymore rule without looking weird(and receive murderous gazes).

"Matsuda, Issei, please pay attention to the classroom." The teacher called out.

"Y-yes sensei,"

"So the rule I just give going to be in effect even with my ownership removed, is it only the person that had entered the room? Will they keep removing the clothes every time they enter the clothes?

"Gahhh!! Why isn't there a manual for this, it would be so much easier!"

Regardless, at least he knows he is free from any consequence if his name got removed, which is a plus, whether his reputation or receiving bodily harm from the females. That's neat at least, though it is a bit shame, he was actually hoping for the girls to actually go Kyaah!!

Maybe he could...

Well, it won't hurt to try at least right?

"I want everyone in this classroom to stop following the rule that I just state." He said, looking around to see if there is any effect.

There doesn't seem to be any reaction, until-

"Kyaaah! Everyone stop looking!" The pink-haired girl Katase shouted as she tries to cover herself, the other girls follow suit and try to quickly put on their clothes back.

Yes, it works! The girls scramble to put on their bra and top.

after that, the teacher tries to calm the situation down, they simply continue with their lesson. A few glares at him, and the entire male students, otherwise that's it, they don't extend than that.

So that's it, no response from the girl toward him for putting the rule? Are they going to try and forget about it,

Well, at the least, with the main issue finally resolve, he can test more on his newfound power without fear of making the entire female ripping his dick off!

So that's neat.