2 Mistresses Make Slave Breathless via Facesitting

The slave has brought a new toy with him, a latex breath reduction mask. A single small hole allows oxygen into the mask. Even without playful and sadistic mistresses, breathing with this mask is already a strenuous endeavour.

The slave lies bound on a mat. He is already wearing the mask when the mistresses bend over him and make him aware of his predicament. They now determine how much air he gets. If any at all...

They take turns placing their fingers over the small hole, depriving the slave of any chance to breathe. He struggles and writhes in his bonds when he realises how scarce his supply is becoming. Fear and panic rise within him until the mistresses release the hole again.

To celebrate the new mask, the slave is given the honour of getting very close to his mistresses' pussies. One after the other, the ladies sit on his face, covering the hole until the slave squirms again. He frantically gasps for oxygen and then breathes in only pussy and arse air.

When will his mistresses free him from this situation?