Your horny stepdaughter jerks you off after finding out you're cheating on her mom

I was at the mall with friends and saw my stepdad in the car with a woman that was not my step-mom. They got married a year ago! My first reaction was sad for my stepmom that she might get her heart broken. But, my second reaction was more surprising. I was jealous that I wasn’t in that car with him. That his hands weren’t reaching down MY silk blouse in broad daylight. I felt angry and felt my pussy twitch in my panties as a little moisture soaked the crotch of white cotton panties. I had the perfect plan. I confronted him and told him that I saw him in the car with that strange woman. I told him that I didn’t want stepmom to get hurt and that if he promised to not cheat on step-mom anymore, that I promise to make sure his StepDaddy needs were taken care of. I laid him on the bed and pulled off his pants.