Her partner was on her bed, tied up by ropes to the bed frame, facing downwards. Yama put her hand on their soft cheek, stroking it. "Oh, my little doll...stay quiet for mommy during this, ok~?" She slowly inserted the strap on, her partner trying to suppress their moans.
She held onto their hips as she started to thrust faster, her partner becoming a moaning mess. She covered their mouth. "Shhh, we wouldn't want anyone to find out about this, now would we? Keep quiet." They muttered the words "Y...yes ma'am..." as Yama slowly picked up the pace again, thrusting harder and harder into them.
Both of them could barely comprehend what was happening as Yama's partner started to speak in between moans. "I'm c..cumming...!" Yama chuckled. "Don't cum until mommy tells you to, ok?" She put in a few more thrusts, going as fast as she could. "Aaaaand...now." He partner came as they let out one final moan, Yama taking the strap on out of them.