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Let's get back to the comic. As a little thank you for your patience, I've included this page´ thumbnail as well.
While searching for references for the upper panels, I stumbled upon a video of a dude beating it to some metal music. Like... following the beats. But I didn't know at the time, as I had sound turned off so I was mighty confused about the movements he made. My partner later told me, that the music beat masturbation thing apparently is a whole thing. The more you know!
Have a great weekend!