Selwyn had not particularly appreciated Lestrange's orders to stay away from the pretty Mudblood. It wasn't as though she were anyone of consequence, she was just another little mutt, no better than a stray animal, and he didn't see what would be so wrong about him having a few moments to enjoy her. He intended to remedy the situation as soon as she was alone.
He almost thought that he had an opportunity, and then Yaxley came out of the woodwork and ruined anything. It wasn't important, Yaxley was quite lovely in a far too assertive way, and she would do nicely.
"I was just looking out for the prisoner." He said, smiling at her darkly. His eyes swept over her, taking in ever detail of her small frame. "What the hell are you doing here?"