Twilight has shared a bed with her brother for countless nights. Sharing their pleasures and desires has created a bond that was built on the foundations of a proper relationship. But one night, as a thought flashes through Twilight's mind, that foundation shakes.

They've missed a crucial step in the process. And it's been bugging her more than she lets on...

Contains: The realization that one's sister has a fatter ass than she was once believed to have, and acting on the impulses that come with such a realization. (incest)

The picture is 2632771 by the talented BookmarkPhantom.

Entrant into the "First Time February" contest.