For those not fully familiar with the Ranma 1/2 manga, this references Chapters 103-105 of Volume 11, where Ranma pretends to be Ryouga's "sister" Yoiko.
@meow_pao Yes, however from what I understand, in this fanwork, this is a "what if story" where Yoiko actually existed... so the "Ranma Saotome" and the "genderswap" tags shouldn't really be applied to this comic.