When I woke up, I honestly thought it was my girlfriend sucking on my cock. I'd been out and must have gotten too drunk. I'm not too sure how I ended up at my parents home, but when I looked down with my cock was being so lovingly sucked on by a blonde. My girlfriend is blonde, so I shut my eyes and enjoyed the wonderful if not blurry sensations her awesome mouth was giving me. When I came, and this is where things changed, she swallowed every drop of my cum. My girlfriend hates swallowing cum and she has never once offered to do so. Hearing her loving the taste of it, I opened my eyes, looked down properly and saw my younger sister looking up at me. She told me she'd wanted to suck me off for years and given I was in my old bedroom naked and drunk, she'd took the chance to offer a much better blowy than my girlfriend. And the fact is, she was right.
Casey is nineteen years old. A very good looking girl who kind of floats through life. She's a great sister if you like girls who don't seem to do anything. The one good thing I now know she can do, is suck cock. Not only that though, as we've gone on to push the boundaries, with both of us now giving each other oral sex.
It's been two months, where when we get the time and a free place, we're constantly at each other sex. We know we shouldn't be having oral sex, yet I cannot resist my sister and her beautiful pussy. My problem, if it is a problem, is Casey has been begging me for nearly a fortnight, to fuck her. So far I've said no and resisted her obvious charms, but I'm not sure I can hold off for long.
What's challenging me, is my girlfriend goes away in a couple of weeks to visit her parents over the festive season. Our parents as I've just found out, will be taking three days away to visit my dads brother. Casey has already told our parents I'll be staying to look after her, and my parents have even done up my old room.
Little do they know, I'm probably going to be spending most of my time in my sisters room. All I have to decide now, is am I going to give in, or not.