So it seems these wolf tendencies, or whatever it is, arises when the infected person is in heat, and it looks like it doesn’t matter what the gender their interest is. Issei was both attracted to a guy and a girl…maybe. >_> And I guess their time is during the Hassaku Harvest. That’s when the masked girl comes out at night and takes care of the person in heat…perhaps to keep the wolf people population in check.
I’m just speculating… -_-