Smother Play
Fetish sexual play whereby a female mounts their partner (M or F) and envelopes their partner's face, nose and mouth with her vagina. This smothering act is accompanied by vigorous face riding and induced oxygen deprivation for their partner. The face is ridden until the partner taps out or muffles out their chosen safe word.
Rachel and Frank are into some kink. Her extra pounds comes in handy when they smother play. He almost passed out last time before tapping out.