After her first experience of breathplay using the bubbler bottle, Karina is next put into the heavy rubber straitjacket and tied down securely on the bed. We know that she will NOT like the next experience!
A Russian gas mask replaces the modified S10 mask that she wore for the first experience and the rubber hose is reconnected to her mask. A prolonged period of BP follows during which the air supply is restricted by varying degrees.
About 8 minutes into this video we switch the liquid in the bubbler bottle from water to karina's own piss. Even though we start this phase very gently karina notices the change immediately. She does NOT like it one little bit.
Her predicament worsens as the tube is pushed into her piss and she experiences the full effect. She tries to escape but even worse is to come as her entire air supply is cut off by a finger placed over the bubbler bottle input tube.
Suddenly piss-scented air seems very attractive. :)