It would be like if I was expected to deliver A by the end of the quarter and instead I delivered A + B. The value gain from B was more than A. Your manager (and hopefully higher up the org) better know about B, or they will attack it as a threat.

Also, I’m not being paid for my time, I’m being paid to do a job. “Trading your time for money” is one of the most self defeating views on work you can have. It reduces you from a worker with agency to a detached prostitue, and is harmful to both the employer and employee.