I am curious for your answers

Write your favorite wedgie and why you like it, and mention which character(s) you would give it to.

Hello, I hope you are all well, I am looking for a story that I read a long time ago, however I could not find it anymore and I would like to know if anyone has seen it or added it to their favorites, the story is called "a magic lesson" or something like that, and it is about the character Yohei, from the anime "Grimoire of Zero", in which he uses Zero's spellbook to try to become stronger, however not understanding the language, he ends up casting a spell making his underwear come to life, thinking that it did not work he decides to go to a tavern, but the spell is activated, and he ends up receiving different wedgies from his own underwear. After much humilliation he decides to return to where Zero was, obviously without telling him what happened.

If anyone has it, I would appreciate it if you could tell me :)