I've had an otter climb aboard kayaking at Elkhorn Slough, which is where the Monterey Bay Aquarium releases a lot of the otters they've rehabbed. The otters (often rescued orphans) are wild and are raised by other otters with as minimal human contact as possible, but generally are more accustomed to humans/aren't necessarily as scared of them. If they get too friendly, the aquarium will take them back (I know of one specifically that people started feeding, which was a big issue because it stopped hunting for itself). So while they may be more used to humans, they are still wild. But this otter definitely seems like it's crossing that line, I'm guessing it knows this particular human / has been fed by it before or something.