No, it is not immoral.

It is a business. She is legal age. Its consensual. Its what you desired. A connection was made. Enjoy it.

Discussing other professionals is risky - for this reason. Feelings can surface of jealously and greed. If you (or the person you are talking to) can not handle the content of the discussion, it is better left unsaid. It is immature behavior to say this.

Celeste