Disclaimer: I own nothing. This is just something I came up with randomly. May add more later.
Feed
Vader looks down at his son. Though he is an adult in years, in the Force he is but a small child who needs their mother to feed them. His son looks at him with greedy eyes. Vader knows that though his son has accepted the Dark Side he is seemingly unable to fuel it himself. So Vader opens himself up to his son and let him feed off his father's darkness. Through his father he finds strength and power. Eventually he will learn to feed himself. Until then he will feed on the strength and darkness his father provides.