He stepped back from the woman, eyes on Bellatrix, knowing exactly what she was asking of him, part of him horrified he would not be able to complete the task. He would though, and he could. He'd thought of it before, the sheer pain richocheting through your limbs as they turned in on each other, the screams, the horror.
When he looked down at the woman, her eyes were wide and pleading, terrified, and it was the fear that did it, the same way Marietta's fear at times pushed him, made him do things to her just because he could.
"Let's find out." He aimed his wand at the woman and focused on her eyes, solely on them, knowing she could see his, how dark they were and dangerous. He hoped she feared him.
"Crucio!" The magic licked out of his wand and into her, invisible torturous fire, and then she was screaming, high and terrified, her body contorting in on itself, and the husband was screaming too, muffled and garbled in his throat, and Padrig felt it filling him, the sheer power of it, more seductive than anything he'd felt before.