[This video was shot with full consent of the model. The model was assured that she can pause or terminate the shooting and be released from any risky circumstances at any moment, by using predefined signals including but not limited to safe-words and safe-moves. WARNING: The video features performance by either professionals or under the supervision of professionals. Do not attempt to recreate any actions similar to the ones that appear in this video. No solo breathplay. NEVER.] In this video, Xiaoyu-senpai was bagged several times, but that’s not all. During the breathplay, she put a Bluetooth microphone on her chest enclosed by a glass as an amplifier to record her heartbeat sound. This is something new to us, but it worked quite well! In the first three rounds, Xiaoyu exercised before she was bagged, so her heartrate was already high from the beginning of recording. The next three rounds she started from still at different locations of the hotel room. In the last round we chat a little bit when she was bagged, and we let her stay to her limit. The left channel replays the environment sound, and the heartbeats are put in the right channel. We hope you enjoy this video.