Yes, yes it is.It was the drink wasn't it
BOO THIS SHIT SUCKS!!!!
ITS CONTAGIOUS!!!!
It was the drink wasn't it
Guessing the gender change from her saliva only works if the infected person desires for it in their hearts or something like that.
Cause oniichan would have been a girl long ago if it triggered purely from Haruki's saliva.
There has to be more explanation;
If it was Saliva alone, Oniichan would have become a woman so many times over now.