Mr. Schmidt is getting a hom-smother session again today. But he is married - and has a dominant mistress - Mistress Kathrin! And Kathrin knows how to submit a submissive slave and dominate him by restricting his breathing. But then something unexpected happens - Mr. Schmidt's wife calls during the session. Of course he can't answer the phone as his mouth is covered by Kathrin's hand - so she answers it and know has double control over her slave.