Knotty time

One knot would be enough for her ankles. One knot would be enough for her wrists. Now standing in front of me, wondering what the plan is, she is watching me preparing a rope for the next round.
One knot would be enough for her heavy hair and one tricky knot would be enough to bend her back. Now laying uncomfortably on all fours, on the old carpet, bent like a bow, she starts mixing fear and arousal.
The smack of the red riding crop on my right boot wakes her up suddenly! “So, you wanted to push your limits?”