20 years of marriage fucked!

Would you have believed me to do that? I knew that my stepsister's husband was in the bedroom staring at his mobile phone while she went shopping. I just had to try it out and went into the room in sexy lingerie and heels to wrap him round my finger and he really couldn't resist me. He had already changed a little but he knew he didn't stand a chance. Should I really destroy 20 years of marriage? Of course, I'm just a little bitch, HAHA! So get on with it, I thought, and fuck me hard! Oh, it was so cool to do something so forbidden! He fucked my brains out properly and made me moan extremely WOW...it was definitely worth it! I wonder if he sees it the same way?