Bondage queens.

[Maero]

Yumi bit her lip hard as she felt Mindy's hand slide to her ear and began to flick her ear in an attempt to avoid the pleasure she would create there, moving her head as well. But Yumi was tied up and already purring softly deep in her chest, and when Mindy captured the ear she would find that it was an even greater weak point. Yumi clenched her eyes shut and stopped breathing, trying to resist the sensation, and even lasted for a minute or two, but she was what she was, and with a soft gasp she began to purr full force, her head automatically rubbing into Mindy's hands adorably. "St-stop that..." She protested weakly, though in reality she wanted Mindy to never cease.