Mistress Has Control Over Orgasms and Breathing

How's the breathing? The mistress asks curiously, addressing the slave. He wrings out a short, It's going, mistress. Then he gasps for air again. The slave is standing under a crane. His hands are fixed to a metal beam. The cock is stuck in a penis cage. The most striking thing, however, is the red mask, which does not fit tightly to the face as usual and doesn't have many air holes. No, this mask serves a different purpose. It has exactly one opening. Barely bigger than a straw. Just enough air gets through that.