I stumble upon my stepsister peeing in the bathroom and she surprises me with a blowjob until I climax

I stumbled upon my stepsister in the bathroom, caught her peeing. A wild thought crossed my mind and I made her swallow it. She was taken aback but soon, she got on her knees and started giving me a blowjob. It wasn\'t long before I released, her first taste of my cum.