Bellatrix was, unfortunately quite oblivious to Sirius's momentary lapse, even as he spoke. She was far too fixated on Remus, her eyes flickering over the sweat beading on his forehead, monitoring him with a care that would have almost been considerate were it not for the fact that she was the one torturing him. And for all of his pleas, the only emotion they sparked in Bellatrix beyond the customary thrill of watching another person suffer, was a flash of annoyance that his pleas were directed at her toy. Stepping forward, she lifted her burning curse, instead wrapping her hand under Remus's jaw, her nails pressing into his chhek as she jerked his head up to look at her.
"He will not help you," she said cruelly. "He has no more the capacity for mercy than I. And this ends when I say that it ends. Make him suffer, Sirius. Make him pay for how he has tried to destroy your life, keeping you from your family all these years.". The irony in her words was not lost on her, but she still did not bother to look up at her cousin, her gaze still fixated on Remus as he suffered on the silver chair.