Yukiko gasps sharply when he tugs on the rope, a sharp flash of pain shooting through her breasts and nipples. She winces, squeezing her eyes shut, biting down on her lower lip. "I-- I'm sorry!" she pants. "I didn't want... you to be disappointed in me...!"

She thought it had been what he wanted to hear. If she'd said she wasn't wet, he might have just done this for not being ready for him. His cruelty was capricious, after all.