Make the school your playground

You decide to make some changes to the way the school works, effective immediately.

For the first change, you decide that all classes will be separated by gender, you have the two secretaries fly through the entire roster of student, adjusting their schedules so this is so. You also adjust the school so that the female classes are taught only by female teachers, and the male classes only by males. As an afterthought, you make the secretaries sort the classes by "attractiveness", you honestly have no idea how exactly that will work, but you hope it will be based on your own subconscious ideal of attractiveness. While doing this you realize that by simply using your mind, you were able to make the two of them do something that they shouldn't have been physically able to do. That could be interesting to experiment with later on.

For your second change, you make the standard female uniform while inside the school be simply their bra and panties, you order all girls to strip at the same time as they arrive at their locker in the morning, and put their clothes back on when they leave to go home, that's mostly just in case of inclement weather though, you've also modified the minds of everyone in the town to think that the high school girls wearing just their underwear at school is perfectly normal.

The third change you make is to make yourself able to alternate between being a student, and being part of the teaching staff, other students will treat you normally unless you make them aware that you are acting as a teacher, at which point they will immediately begin deferring to you with the same respect that they would show any teacher. Not only that, but you also make your orders as a teacher absolute to both staff and student, no one would disobey you, no matter what the order.

Finally, you order all of the female teachers (in subjects where it's applicable) to begin shifting their lessons to a more sex based curriculum, you order the teachers of the different departments to brainstorm new curriculums for the next week, then present them to you, but for now you simply order them to do what they think they should to make it more sex based. You also give yourself the current semesters girl's gym class, that could be very fun.

Now that you've made all of these changes, it looks like the school is going to be in disarray as everything is reorganized for the rest of the current period, so you decide to just chill out in the office, naked (that's now normal for you, another nice little change you made), watching the newly half naked girls go by until it quiets down.

About 30 minutes later it's finally quieted down, looking at the clock you realize that your gym class will be starting in about five minutes, and there's not a chance in hell you're going to miss that.