Well, some of the earliest evidence of hypnofetish that I know of can be found in many pieces of ancient Greco-Roman literature. In a lot of said literature, the mind control is usually involved with eroticism rather directly.
I can't recall the exact titles, but, a few examples are:
* A short myth where Zeus used his godly powers to influence a maiden into falling for the humanoid form he had taken so that she would lay with him. There are more than a few stories that follow concepts similar to this, actually. All with Zeus, too. <.<
* Another short myth where a vain young man is made to fall in love with his own reflection. I believe it was due to the influence of Aphrodite, but it's been over a decade since I read it, so...
Then there's also the ancient Greek "original cupid", named <<
en.wikipedia.org/wiki/Eros|Eros>>. Much like cupid, he wielded a bow and arrow that would induce love to those struck.
An example of Eros and his powers:
<<
en.wikipedia.org/wiki/Ovid|Ovid>>, <<
en.wikipedia.org/wiki/Metamorphoses|Metamorphoses>>:
Once, when Venus’ son [Eros] was kissing her, his quiver dangling down, a jutting arrow, unbeknown, had grazed her breast. She pushed the boy away. In fact the wound was deeper than it seemed, though unperceived at first. [And she became] enraptured by the beauty of a man [Adonis].
I imagine that hypnofetish is as old as the idea of controlling other's wills. And control has always been desirable for humankind, so I'm sure control fetishes have practically always existed.
Of course, I have no proof. But it makes logical sense to me, and it's one of those things I'll believe until it's disproven.