Purple-Gauze Girl B Spanked Until Her Legs Give Out, Her Entire Back Covered in Red Marks I Left

The purple gauze clings to the flesh, kneeling posture with arching waist, making the buttock flesh appear even whiter and softer.
Her long black hair falls down, her back already densely covered with red dots and streaks from the spanking, her fingertips trembling slightly when pressed down.
I hold that thin whip, give it a light flick, and she instinctively sinks down, her throat releasing only a vague "Mmm... yes...".
The dominant's hand doesn't need to use great force; the submissive's body remembers on its own.
Every single mark was something she herself asked for, every gasp is evidence of being completely opened up.