This fun little escapade actually became a complete punishment. You expected to have some control, you expected to not be inside another guys ass. But you were stuck, powerless and for the most part, encompassed by darkness. By the end of the third day you could feel the reversion process beginning and you were overjoyed. Waves of dismay washed over you when your dad said, "I'm working late tonight bud. I can't have you becoming a naked boy walking around at my office." You heard him mumble an incantation and your heart sank as you felt yourself get reabsorbed.
Thankfully, your awareness shifted from being your dads dick to seeing through his eyes. Not as awesome as being an independent creature but not as bad as being just a penis. With the intended punishment over, you expected this was your dad's way of being nice to you... but try as you might you still couldn't control anything or communicate in any way. You soon learned that you shared senses with your dad now, the taste of his coffee, the sounds of coworkers talking, it was much better than experiencing life muffled through his crotch.
Eventually your dad left the office. He stopped by a fast food place on the way. When he finally went home he was getting undressed and you thought your salvation had come, but within a minute you were under the covers and dad was sleeping. Unable to make noise or even draw attention to yourself you held hope that tomorrow morning would be your day of freedom
The next morning dad woke early and left the house immediately, setting off to put in another long day at the office. Though he started early he left normal time but instead of releasing you when he got home he went out on a date with mom. It must be Thursday you reasoned. They went out to dinner and dad explained how busy he was, how important it was to the company and how he will need to go in early and stay late tomorrow to get everything done. You groaned knowing this meant you probably wont get your freedom until Saturday when Mom asks where you are and confronts your dad. They went to a movie, and then went to bed and had sex.
The time passed slowly and you were right, Dad had been too busy and had forgotten all about you. Come mid Saturday Mom asked where you were at lunchtime. Dad realized he forgot to turn turn you back and excused himself
Dad went into your room collecting clothes and went to the bathroom he dropped his drawers and muttered another incantation. your senses went black and you could again feel your body getting reconstituted from all the places you were. The shaft was tight and then expanded dropping you naked onto your father's awaiting hand. You were the size of a pea but began growing. He placed you into the shower and began to run the water to warm it up. "Welcome back, I hope you learned your lesson."
You tried replying but you were only an inch tall and he left. After a few more minutes you had grown to a few feet and were no longer afraid of falling into the drain and being crushed to death as you continued to grow, so you began your shower and cleansed yourself. Stepping out of the shower you toweled off and attempted to dress but the clothes your dad grabbed for you were too small.
You went back into your room covering yourself with the towel and grabbed some clothes that fit better but needed a belt, you lumbered back to the bathroom and looked at your reflection, appreciating being back.
As you went into the kitchen you greeted your parents. Your dad said, "Welcome back sport." Your mom screamed in alarm.