A good number of years ago, I had met this woman, look to be honest she was a fuxking slut ..
Anyways we we're have sex one night and her pussy had a muscular spasm . It grabbed my cock so hard I could not move it in or out , it was a pleasant experience at first, then I said ok I want to pull it out she just laughed and said I would have to wait till she had stopped spasming.. It was. Quite a while we were stuck together .. I have never experienced it since.