I've been hoping someone would post this story for so long. Thanks to wuh0810 for posting in [わかまつ]2018年5月にentyで投稿した分 and [わかまつ]2018年6月にentyで投稿した分.

The actual list of mnemonics for remembering the elements works in Japanese to spell out a dirty phrase that Sensei acts out with her student. But it doesn't translate well so I substituted with something that would at least sound plausible in English. The translation of the Japanese phrases is included as well.