Needled buttplug

BDSM idea by Magnuz Binder.

I slowly push the well lubricated plug past your sphincter and hear you whine as its widest part stretches you before your sphincter starts closing on its neck and you sigh with relief. Then you feel the many needles I have driven through its base make contact with your very sensitive sphincter and scream from pain and shock. I tell you, you better not clench on the plug, or your sphincter will be skewered like an insect by those needles. I see your muscles tense, trying to comply, and manage to keep the needles from piercing through your skin, into the muscle.

The first lash from the whip across your buttocks changes that, and you clench uncontrollably, for a second causing yourself much more pain than the whip did, before again managing to force yourself to unclench. I raise the whip again, knowing you have already learned where your focus must be, despite any pain from the whip.