The vid is almost not porn - it’s just a closeup of a girl’s hands carefully retracting a mildly-tight foreskin on a flaccid cock with some Japanese talk and giggling.
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However, the backstory is a bit more interesting (and weird). There are two other vids in the guy’s profile where he apparently demonstrates how to get his foreskin to tighten by applying some paste to it (probably salicylic acid).
I won’t post them here cos it’s just the guy by himself but here’s his profile if you’re interested in checking them out - [Login to see the link]