I couldn't find the original post but here's a post with an edit that Kou Yamori did. It's wasn't a very clear shot unfortunately.
Yeah, except that she NEVER ends the videos with a proper climax. The videos are supposed to build to a crescendo but she fails at that video after video, after video. She will have the "best" stuff halfway through, and leave the last 5 or so minutes with the most boring build down so far. Even if someone could jerk off to this tame ass shit, they wouldn't need to last the whole video