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This is almost exactly how I thought their sex played out. Only it involved them sticking their pony tails into each other. So, like docking with ponytails...

Those little tentacle things come out and wrap around each other to exchange genetic information.

Edit - Oh, just saw the full video. Yeah, he had the same idea I had. That's the same dude who did the Saturday Morning Watchmen and the American Akira videos, right?

as well as Hal the Misinterpretive Porn Star. goes by HappyHarry.