Hinako sub, wearing a female mask, is put in a leather rest sack and bound even further in the segufix. From there, she puts a ventilator mask on him, connected to a bottle of her pee. However, because the ventilator has some small cracks in it, she puts a gas mask over that, making for an excruciating breathing experience. Finally, as a reward, Hinako grants him the pleasure of being served a huge helping of her pussy.