Step sister insists on controlling my penetration depth

I'm not sure what's going on with my step sister. She seems to be obsessed with controlling my penetration depth every time I'm about to plunge into her. It's not like I mind it, but it's a bit weird. She's always telling me how big my cock is and how she can't get enough of it. I suppose it's not the worst thing in the world to have such a horny step sister. Anyway, I don't mind indulging her from time to time. So, when she's lying on her back, I can't resist the urge to spread her legs and plunge my monster cock into her. It's not just about the penetration, though. I love to watch her squirm as I fuck her hard and deep. And when I'm done, I can't help but shoot my load right inside her. It's a sight to behold, and one that I'm more than happy to share with you.