Rodolphus actually held his breath when it seemed she might draw her wand on him but sadly, things never came to that. Of course now that he had been on the business end of the Dark Lord's Crucio it was unfortunate that he would spend his life chasing that high. Just the memory of it hurt and in the days after the encounter he had even dreamed about it. He'd never felt so alive. He didn't know how he could both want something and be afraid of it at the same time.
It was Evans, he realized, and felt like a fool for not having come to that conclusion earlier. He remembered the exchange well and it brought a new smile to his face, not unlike the one he'd expressed when reading it the first time. Well, Bellatrix was definitely right about one thing. Lily had it coming. "I suppose Narcissa has to be there," he complained more to himself than to her but it was an objection he could live with. She wasn't so terrible and being nice to her could only help him with her sister.
As Bellatrix removed the necklace, Rodolphus grew uncharacteristically stoic. He sent her those letters unsigned not because he didn't need to but because he didn't want to discuss them in person. He never felt more vulnerable than he did when relating such intimacies to another person and having them brought up now was just as awkward. He had planned on attempting to earn some sort of compensation - a kiss on the cheek or a second evening out with her - but what she was ready to hand over held more value than anything he could have imagined. "I'll go with you," he agreed. "For that necklace. And I'll help you." He had given her a trophy and she was returning a different one to him. So this was why people wrote poetry.