I myself would never date my boss no matter how I might feel about her.

Also, a boss is unwise to express interest in someone who works for her/him. You might consider him an equal, but if you “technically” are his boss then you are his boss and if you were to pursue him you would leave yourself open to a sexual harassment claim if he didn’t like his assignments, performance review etc. You could also face criticism from your superiors even if he did not make a claim against you.