All depends on how hard you want to go:
Chopsticks and rubber bands; pillowcases (for armbinding), 550 cord; macrame hoop, bungee cords and clothespins; toothpicks; a silk tie (multiple uses), pocket square; a belt (not the obvious, for her waist so she can’t “twist” and avoid the deep dicking); washcloth, pitcher of water and a bell. .

At the end of the day, it’s more psychological than physical. Whatever gets the sub’s imagination racing...

My ¥2

-Sarin