Maybe as a follow-up, "overstimulation" is kinda like continuing after you've cum, at least that's how it is in the video. It's intense though, so again, please don't jump into intense stuff or BDSM-relating things without learning about them better first - learn about safewords and consent (or consent models, like the common SSC and RACK) before doing it with a partner, learn about aftercare regardless, etc. I probably have resources at my fingertips where needed.
Okay, it's a bit hard to explain here because of prohibited terms on this website, but I continued because it's a major point of the video - overstimulation. It's a BDSM term of sorts, and can be pretty intense, so before you do anything like what's shown in this video, please look it up/research it and learn about stuff like "aftercare" - even if it's just you giving it to yourself.