Siren
Letting out a long stream of air, she gave a small smile.
"Well, alright." She said, hoping that she'd at least gotten some practice at keeping the singing power low enough that the person still retained their willpower. Standing up and keeping her hands together, she closed her eyes and took a deep breath, beginning to sing a small melody that she knew by heart.
"
The heart of the warrior can never cease to beat,
As long as there is spirit, his fire will still have heat,
What keeps the warrior going is of his own choice
As long as he doesn't stray, he'll always keep his voice"
As she sang, she would feel the hypnotic power of her voice begin to manifest itself, each of her words becoming more powerful as she neared the 2nd and 3rd line of the song. It wasn't the entire song, mind you, it was only a small snippet. But, a full song, if sung by her, could take away a person's freewill to the point she could convince them that they could fly or even that they were made of stone.
With the final words sung, she would look at him, seeing through the glasses on his nose the eyes of a hypnotized person. The effects would wear off, as she had not sung enough to make it permanent, but he would definitely notice the hypnotic effects of her voice.
((Wasn't sure if you'd be immune to it or not, so I was very brief and gave a general description of what it would do, rather than assume.))