Some people are more strongly affected by the moons than the others.

[After a moment, she does remember one awkward trait about Iris, and clearly sharing is caring.]

Iris people...well. One of the things I know a lot of them experience is heightened arousal.

[Youkai senses make that particular detail hard to ignore, and if she can smell it, she can only imagine how much more strongly Sesshoumaru and Inuyasha do.]

Those kinds of effects can be very pronounced with some, while others don't seem to experience those at all.