[Demon Lord Etna]

Hello, sister.

Honestly, I can't tell you why you're getting the occasional erection other than to say that you have a penis, and sometimes they just do that.  Depending on how long you have been on your journey, you are probably still on the downward slope.  What you have to remember is that your body is physically predisposed towards a male hormonal trend, and you are using the herbs to combat it.  You are quite literally at war with your own genetics.  The purpose of the herbs is to rebalance the hormones in your body.  Some are adding phytoestrogens, while others are neutralizing testosterone.

Think about how long a genetic male and genetic female take to go through puberty.  You've already been through that once and are now trying to go backwards, unpuberty, so that you can start over and go the other way.  This means that your hormones will be supercharged for a while, and that means you will have to endure the occasional effects of that, and for men, unsoliscited and uncomfortable erections are a part of it.