Take off those boots

Of course, before you can take those pantyhose off, those boots have got to go. Glynda had turned her attention back to the class, so as discreetly as you can, you reach behind Glynda's right leg and began pulling down the zipper at the back of the boot. Once it is pulled down all the way, you do the same to the left, and once both boots are completely unzipped, you make your move.

Glynda: Now everyone, we will talk-AHH!

You quickly swipe the boots off of her feet, getting her off balance a bit, and as she tries to regain it you also swipe her skirt.

Weiss: Professor, is something the matter?

Glynda: Y-Yes, everything's fine

Glynda looks down and finds to her shock her boots were missing, only seeing her pantyhose covered feet, and realizes to her horror her skirt, which had fallen around her ankles, had disappeared too. She looks under the podium, but finds nothing, as you silently thank your semblance for also having the power to turn whatever you touch invisible, as you did with the skirt and boots. Glynda turns her attention back to the class, you look at her pantyhose covered feet, and a rather mischievous idea comes to mind.

Glynda: Sorry, as I was saying-HAHA!

All the students are surprised when Glynda suddenly laughed, none more so than Glynda, who felt what seemed to be a finger slide across her foot

Jaune: Did you just laugh?

Glynda: N-No, I-HAHAHA!

You lift her leg up a bit and tickle the bottom of her foot, causing the normal serious teacher to laugh uncontrollably

Glynda: HAHAHAHAAHAHAHAHA! WHA-HAHAHAHAHA GOING ON-HAHAHAHAHAAHA!

Everyone looked on in shock as the woman who was normally stern with a serious demeanor was now laughing like a schoolgirl.

Yang: (getting a little creeped out) Um, are you feeling okay there, teach?

Glynda: I'M-HAHAHA, I'M FINE-HAHAHAHAHAHAHAHAHAHAAHA!

You switch back and forth between the feet, tickling those pantyhose covered soles, delighting over how ticklish Glynda Goodwitch was. You decide to end the tickle ****, before she gets suspicious.

Glynda began claiming down, whatever was happening to her had finally stopped

Glynda: (thinking) I could've sworn someone was tickling my feet. Oh my god, everyone was watching me laugh like a madwoman. Why is this happening to me?