First things first, you have to return your member to fighting shape. Drained by the fucking you've given your sister, your member lays against your thigh. It has returned to its flaccid, softened state, occasionally dribbling out small amounts of semen. Generally it would take a few hours time for your libido to rekindle after what had happened. With the program at hand, though, why wait?
You pull up your own page once more. As expected, you find that your 3D image has been updated to reflect your change in wardrobe. Looking the program over carefully, you notice that the box with the basic information about you has an "expand window" icon at the top. Upon clicking it, you're greeted with a giant graph that stretches across the screen. It contains a multitude of different bars and meters, ranging from things as standard as your heartbeat to things as odd and pointless as the growth rate of your nails.
Nearly overwhelmed by the flood of information, you dig into the information for what you're looking for. Soon, you come across it: a bar labeled "libido". Reflecting what had just happened, it sits nearly empty. Throwing caution to the wind, you immediately grab the ticker and jam it up as high as it can go. Without even questioning if perhaps going from the minimum to the max could be dangerous you hit the "apply" button and wait.
After a few seconds, your heart begins to pound violently, pumping at a psychotic rate. Your blood, filled with a massive amount of hormones, flies through your system, headed straight for your cock. Like a spooked cat it shoots up, hard as a rock. The member presses strongly against the fabric of your jeans, leaving an obvious six inch bulge.
Back in action once more, you went to unzip your pants for a bit more fun when you hear a knock at your door.
"H-hey, Pete?" Jessica's voice says softly through the door. "Can I come in for a second?"
"Sure." you reply.
Not wasting a second, your sister walks in, a worried grimace plastered across her face. You notice that she has put the gym-thong on once again, most likely because nothing else of hers would fit. She catches your eyes staring a her backside and speaks up.
"So I'm not crazy? You see it too?"
"Of course I see it! Who could see something that big?" you joke.
"Shut up, Pete! This is serious! Asses don't just grow overnight like this..."
"Well, how does it feel? Sore?"
"No, it feels normal, but..." she trails off. From the redness that flushes to her face, you can only guess that she was about to tell you what happened in the shower.
"In that case, it's probably just a growth spurt Jessica. Nothing to worry about."
"Nothing to worry about?! Of COURSE there's something to worry about. I can't go to school in a thong and this things' all that fits!" She complains, tugging on the warped fabric.
"What do you want me to do about it?"
"You're bigger than me by a bit Pete. Maybe your clothes would fit? Or we can skip school today and go to the mall. I'm sure Mom would understand..."
Letting of an annoyed sigh, you reply...