You try to figure it all out...

As the hot water rains down on you, you close your eyes and your fingers slip around your achingly hard cock, a flood of thoughts run through your head. Confusion and arousal blur together as the image of her improbable body overwhelms all other thoughts you have. Even though you'd never had any attraction to men in your life, the sight of your gorgeous bikini-clad stepsister and her thick cock had your cock absolutely rigid.

Slowly stroking your stiff cock, you let out a soft moan as questions continue to bother you. How could a gorgeous girl like Amber get through high school without such a huge secret getting out? Had your father even known about it? How did this kind of thing happen anyways?

You knew there were surgical ways for people to change their sex, but there was no way that your stepsister, (who must have been the jerk off fantasy of most every boy in her school, just as she was yours now) had ever been a male...

Despite all the questions running around your head, your hand has continued to jerk your cock, faster and faster, until the now familiar tingle of an oncoming orgasm fills your body.

Just at that moment, there was a knock at the bathroom door.