Naturally induce labor...

I'm currently full term with twins and I need to induce labor within the next two days or else my ob is going to take them c-section. I really do not want a c-section and I'm not a candidate for induction because I've had two previous c-sections....I've tried everything!!! Walking, sex, spicy food, nipple stimulation, stairs, trampoline, and eggplant!! (Which tasted nasty!!)