I couldn't get it to download off pixiv properly so I had to download the zip and put it in a video editor. It came out a bit too fast.
I have a pixiv extension that failed to convert this to webm, wish it gave an mp4 option. I dl'd it as a gif that was like 17mb, but I see you beat me to it.
I love this btw, mass produce buris, they are the best yukkuri.
edit: I love how if you look closely, their expressions change from dumb joy to terror.