Go for the slam

You're not going to be able to throw her off, her grip is too tight. Instead you spin around and lean back.

"Enjoying the taste are you?" Mrs Mills taunts from above, her crotch still grinding against your face.

With a jolt you throw yourself forwards, slamming her back down onto the mat, you land in a heap on top of her. No time to waste, while she recuperates you quickly readjust your position and hold her down in a pin.

"What..what did you do? That's not..ugh" she sighs. "Might as well get this over with, I submit" she says.

Well, that was easier than you expected, but now what are you going to do with her?