Whips & paddles
Whips and paddles are popular sex toys to use to add annoying pain. Whips can be more difficult to control before you have learned the technique, but they are also lovely because they can both be used lightly or touch hard. Paddles are flat and distribute the stroke, and thus the pain, on a larger surface which is easier to control than a whip. Always test the sex toy on yourself before whipping your partner so you know how much it feels.