Holiday Boredom

Neither of us are in current relationships and so spent our time together over the weekend and Christmas. No people to visit or hangout with we soon got pretty bored. Playing cards didn't do much erase the boredom, so we started to spice the game up a bit. One thing led to another and thus we started fucking, well one fuck between siblings isn't really bad as precautions were taken. That was if we stopped at one, we didn't, and we've slept together ever since. Every day we're fucking at least once and can't seem to get enough to make us stop. Returning to work after holiday stopped sex until we got home together, and we were back fucking within an hour of getting back together. What started from boredom, has turned into an obsession for us and we can't stop fucking. But my sister is pretty and better looking than any girl I've dated or fucked. She is my Christmas present and I'm hers.