Younger stepsister seduced me

I have a confession to make: my 18 y.o. stepsister is an ever-horny slut totally addicted to my cock. She always wanted to seduce me and with a sexy body like that she knew I just couldn't resist the temptation to fuck her. What was I supposed to do when she got in my bed and stripped naked, then pulled my cock out of my pants and started sucking? I'm a man, for fuck's sake, of course I nailed her. That tricky bitch loved it big-time!