Body cramped like I was a dying spider

Im fairly new to prostate play but something happened today.

Today was my 9th or 10th session using the Edge 2 from Lovense without it vibrating. I don’t think I’m rewired yet at all but maybe this is a start. I did the usual thing of laying down, relaxing and preparing myself, slowly inserting my toy, relaxing more, applying more lube, eventually getting the whole thing in and relaxing more until it all feels fine. Then I started reading doujinshi as it can build a slow arousal throughout the story and facilitate fantasizing of wanting to be some of the characters. I was breathing slowly and deeply through my diagram and using my pelvic floor muscles to move the toy like usual when something new happened.

As I read, my hands, feet, face, and the top of my stomach started to tingle. I didn’t try to chase this feeling and just stayed relaxed. I continued breathing and reading as the tingling grew more and more. I allowed myself to sink deeper and deeper into the feeling, but realized it was not just my skin being sensitive, but my actual muscles in my hands, legs, feet, wrists, lips, and fingers all were being activated and holding. My wrists was bent in, my fingers splayed wide, my thumb curled into the palm, my arm curled into my chest, my lips pursing, my legs bending and feet flexing outwards. I felt like a dying spider, with all my limbs coiling into my chest.