Strange Ejaculation

I was edging last night and I had something odd happen. I was looking at some porn and found myself about to come, but I didn't want to come just yet, so I clamped down hard with my PC muscle to stop the ejaculation, just like I had several times earlier that evening. This time I was a little bit closer to orgasm, maybe even sort of there, but clamping down did stop my ejaculation.

I relaxed my PC muscle, but about a second after I did, with no muscle contractions at all, a long jet of cum came out! It was like it was stored up, pressurized somewhere. I've never had that happen before; I didn't have an orgasm with it, but later when I finally did let myself come, I shot further than usual. Maybe it was because the muscles were toned up and ready to contract harder down there; whatever it was, I'll have to explore the phenomenon further...