I (40m) hired my secretary (21f) for her looks, and now shes my freeuse slut

My secretary had the minimum skills needed for the position, but showed up for the interview showing off her best assets in a short skirt with her boobs pushed out. I figured I'd give her a shot. She caught me staring at her ass one morning, then gave me a show after lunch by bending over with no panties on. The next day I asked her into my office and fucked her raw for 15 minutes. Now its a regular thing. I told her I'd give her a raise for anal. I wonder if she'll show up next week with a butt plug?