Lord EA seems to have spent quite some time in the Pleiades, like it was a region of the sky he had a certain affinity and had a great influence over a certain group of humanoid/reptilian giants, to such a degree that he managed to bring some of them over here to Earth.
Their offspring became the 'Nephilim', the giants who walked the Earth in ancient days. The effect this created is the 'karma' the 'Pleiadian' group, channeling from the future (in our terms), are trying to resolve, because the effects of what they did have had ripple effects way into the future - even our future.
The title 'Lucifer' fits well into the character of EA/ENKI, who rebelled against his own people, and the Orion Queen in particular, and therefore also against Mother Goddess. He is the Light Bearer, because light is information, and he brought information (light) to the early humans and enLIGHTened them.
This is one way of looking at it, but the Sirians were not the ones who particularly came down here because they found women irresistible. There were no women here when the Sirians came, only androgynous humans.
Therefore, the real Watchers are 'the 'Pleiadian' group' who rebelled together with EA, Lucifer. They were the ones who found Earth women irresistible and mated with them, and later created the Giants, as we shall see now.
These were the 200 'God's Angels' whom Lucifer (EA) brought down from 'Heaven the Orion Empire' to the 3rd Dimension of matter, the Earth.
Thus, they became known as the 'Fallen Angels'. This was not peculiar in any way, because the Pleiades was (and still is) a part of the Orion Empire, and EA was the Prince of Orion. He must have had followers on many planets.