My unusual bond with my stepsister and how I addressed it with my girlfriend

I've always had a strange bond with my stepsister. It's not like we're blood-related or anything, but there's just something about her that draws me in. Maybe it's her tight, round ass or her perky little tits. I don't know, but I can't help myself. It's like I'm walking around with a hard dick all the time, just waiting to touch her. My girlfriend knows all about this little secret of mine. In fact, she's kind of into it. She's always been a bit of a naughty girl herself, and she loves nothing more than watching me fuck my stepsister. It's not just about the sex, though. It's about the forbidden nature of our relationship. It's like we're committing some kind of sin, even though we know damn well it's not really wrong. But anyway, my girlfriend knows how to handle it. She's always there to give me a little instruction when I need it. And let's just say, I need it often. So, if you're into some hot, nasty action with a group of horny teens, you've come to the right place.