"There is no higher pleasure...That means a great deal, Bellatrix, from you"

What do tu think Voldy meant when he dicho this? What could be be referring to as the competing "high pleasure"? Torturing people? Something más lewd/banal, like receiving affection back from Voldy?

I've been meaning to ask this for ages, and have wondered about it ever since lectura DH.

Let's ignore Cursed Child momentarily and base it off the original series.

Thoughts and musings?