Stepsister teased me in to getting hard for her at the family get together

She has always teased me. We have always had a laugh together but I've never taken her seriously. It was something else at the get together, flashing her panties, making sure that I could see down her blouse. She wanted me hard and she made sure that I showed her. It drove me wild, her fingering her pussy right there next to me, letting me feel how wet she was but not letting me slide it into her pussy.