My stepsister and I have two major things in common: we both love sex and we've been on a dry streak recently, so when I walked in on her masturbating I knew exactly what I needed to do to make it a win-win situation. That day I gave her oral pleasure and she must have luved that ejaculation cuz the next day she returned the favor with a fantastic blowjob. My big cock struck her so much she wanted more, so we've been fucking ever since. Family-style!