You were a successful business woman/man that worked for a top secret government experiment.

Experiments were locked up in a cell, dangerous ones were chained.

And one of them was experiment 609, the most active, dangerous and strong one but surprisingly quiet, known to be a vampire or..

One day you were in his cell while he was acting stupid and not listening.

You zapped him through the zap collar on his neck as he let out a low grunt.

"Be gentle."

He said, his voice low.