Throughout most of my teens I was subjected to the power of my cousin Beverly (not her real name) who was three years older then me and liked nothing better than to wrestle me to the floor and render me helpless, using her superior height and weight. These sessions invariably culminated with her smothering my helpless face beneath her tight, damp knickers. Her fave holds were front and reverse facesitting pins, high, smothering headscissors with my face held tight into her crotch. Her preferred scissor hold was the reverse figure four which enabled her for force my face hard into the thin wet crotch of her knickers by pulling back hard on her crossed over ankle. These sessions would only end once she was fully satisfied, sometimes she would achieve 'satisfaction' three or four times before finally letting me go.
If she was staying over, which she frequently did, I would sneak into her room later on and achieve 'satisfaction' myself whilst clamping the pungent wet crotch of her dirty knickers over my nose and mouth (she even caught me doing it once, but that's another story).
She had totally conditioned me to associate smothering and the smell and taste of her juices with the sexual urge, this has effected my entire sex life on into adulthood. I don't know whether to thank her or curse her, but hey ho, it is what it is!