Belts are the most versatile piece of clothing ever. You can use it to whip, to leash, to choke, to mark, to gag, and even once in a while to hold your pants up.
She didn't wear underwear to work, as usual. It gives her a thrill under her prim and proper work clothes. Secretly, she'd always fantasized about being bent over her desk, and used like a total slut.