Basically this needs no explanation.
The effect is quite clear lasting a lifetime.
Listening is like falling into a barrel of blue magic potion like Obelix did when he was a child.
After it, when you wake up out of the trance, your erection always will be really steely and lasting for indefinite long times, whenever you get hard for any reason.
You get steel beam erections just for fun, and just stupid erotic things may keep erection ongoing for several hours at all.
Your erections are simply overpowered, but you have to deal with them each and every day, starting with exaggerated morning wood up to having a boner when falling asleep.
it's not that you are always hard, but you find having an erection is a great passion. You simply love your cock, but you love it rock hard all the time, at least when possible.
And because of the power of this blue magic potion you can stay rock solid, having a gargantuan boner whenever you want to.

Disclaimer:
The effects become stronger with each listening. Don't overdo it, because of the everlasting effect. You may end up having constant erection almost eternally long-lasting. Your erections may become uncontrollably popping out of pants in the middle of public for no reason at all. Stop listening when desired outcomes are manifested.
i just want to be honest with you, because once the effect has manifested, it's only to boost to stronger levels by listening again, but never reversible.
It's a real hypnotic session having real lifetime impacts on you