She bites her lower lip, the only betrayal of her nerves, and gets up on the bed, straddling his waist. She does not sit down in his lap, does not offer friction or tease, but she's a short woman - she's close enough.

"Arms up," she instructs gently, pulling the ropes loose so she can use them. As soon as he obeys - and she knows he will - she will tie them neatly together, and loop the ropes around the headboard a few times. Loosely restrictive, but completely out of his control.