Locked_inSteel involuntarily contractions when plugged in chastity belt

Hi all,

TLDR:
I'm wearing a chastity belt with anal plug locked-in. Very comfortable, but at times when I'm relaxed to the point I forget I'm plugged in chastity... totally unexpectedly my sphincter muscles contract involuntarily, and feel a quick squeeze, like tiny fist grip on my butt plug trying to suck it in. Then it settles... and comes back later at random.

Is that normal?

Long story:

I'm wearing a Continuous-crotch male steel chastity wasiband belt with a small i-Bolt steel anal plug firmly secured on the secondary slot and locked-in.

The anal plug is a small i-Bolt "lollipop" metal butt plug with 4 graduated spherical balls on a shaft engaged on a longitudinal track on the crotchband, free to slide to adjust to changes in body posture.

Once the belt is locked, the plug is forced all the way inside, the balls rest in the rectum and the anus wraps naturally around the thin shaft. The plug shifts forward and back and always in the right position to line up with the hole, but ZERO vertical (up/down) motion, can't push it out or pull it in, so it is not removable while the belt is locked. VERY COMFORTABLE!

The shaft is 5/16 diameter and 1 3/8" long till it gets to a 25mm ball, followed by a 22mm ball, 18mm then a 15mm as the top one. Total length is just shy of 5" from slot groove to tippy top. (Less than 4" insertable in the rectum). I do not even feel it when inside other than a slight pressure sensation. I do feel that insert when I try and tug the shield to the side though. Not painful, it just stops it from happening. It is small, long enough to not be able to be pulled out if you slither the front shield away some but not long enough to be sexually gratifying, big enough diameter that it interferes just enough that you cannot get past it but not so large that it gives a full feeling. Basically, it is just the right size to be intensely frustrating if you try and get around it. Not painful at all, and not gratifying one bit. Its just....there.

Can move or sit all day, with no major issues. Low-level stimulation that feels "good", but not enough to feel "horny" or leak. (it can, if I try). Good and very safe for going out in public.

Now I'm seated, I don't feel the plug itself.. only a tiny pressure sensation from penetration, totally relaxed, but at times, I feel my anus "grabbing" it, and trying to suck it in... (secured on the crotchband, the plug won't move).

There are not any additional issue. no pain, discomfort, bleeding or numbness. Very comfortable. Don't feel the butt plug, but I don't like "reminders" in the form of random spasms...

Just had another one a minute ago. And when that happens, I get an soft-erection, not hard, but enough to fill the penis tube and aroused. Not intense, but distracting...

When I'm wearing bigger and larger plugs that stimulate, I don't get these random spasms.