Play with her breath...

You look down on Sarah and lovingly stroke her latex covered cheek. "Resist all you want."
Immediately she starts to wriggle aroudn like crazy, you pump her gag as she starts to call for help and cursing you in the name of God. You can´t see her eyes, but you´re sure she´s terrified.

Next you playfully pinch her nose. Her struggles intensifies, she starts to hammer her feet against the floor. You let her breathe and straddle her thighs. You then lie down over her and again pinch her nose. As she squirms under you you say. "Don´t you get it Sarah, I´m in Control here. Not you."
She shrieks and keeps on with her futile struggle...