He kissed her again, smiling in satisfaction. Good. It was a real big thing with him, making sure that Faith was comfortable with everything that he did to her. He wanted to make sure that this trust of hers didn't go wasted. It was a valuable thing to him and he was determined to do whatever he could to make sure that he never lost it.
That didn't mean that he had to be terribly nice about what he was going to do next. She said that he could do whatever he wanted. Teasing her until she begged him to give her what she wanted seemed right on par for the situation at hand. Smirking, Sam resumed his earlier position at her neck and started to kiss his way down. Finding her shoulder with his mouth, he bit down again and started to suck at the skin there. His plan was to tease her into all of this. Instead, he found himself wondering how long he'd be able to personally last. He really did need to remember to have more patience.