With the rebreather mask tightly secured, Mistress Ruiko fully controls the sub’s access to air — covering and uncovering the small breathing hole at will. She lies across his restrained body, teasing him with the scent of her panties before moving into face-sitting. His head is tightly wrapped and secured with a cushion, leaving only his nose exposed for minimal breath. Trapped beneath the weight of her body and the breath control, he surrenders