Becoming lovers with stepsis

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 loved that orgasm cuz the next day she returned the favor with a killer blowjob. My big cock impressed her so much she wanted more, so we've been fucking ever since. Family-style!