My father and I had a strange relationship, which was very open due to our mutual use of drugs. Once, while very drunk and high, he confessd to me that he had sucked a cock and liked it very much. I confessed that I had snuck into my parent's room and wore my mom's panties. That was the end of it until he came into the house one day with a new drug that was supposed to break down the barriers of communication. He asked me whether I would take it with him. I said yes.

We took the dose and he said that he was told to get the whole thing started by sharing something you normally wouldn't. I suggested that we each share our porn stashes. We pulled out our black cases and opened them up and found that we had the same kind of porn. Both our stashes were filled to the brim with incest and shemale porn. I had a small collection of lingerie. dad had pictures of my mom edited so she had a huge dick. The drug most have started working because that's when I had a sudden flash of an idea and knew that dad would agree.

As he put "boys gang raped by trannies ten" into the dvd player, I pulled out a pair of pink panties caked with my cum.

"Would you wear this?"

"Yes," dad said, as he stripped naked. I helped him step into the panties and brushed my hand against his dick. He then pulled one of my mom's nighties from his bag and I put that on.

"I still sneak into your room and I come in mom's panties," I couldn't help but say. 

"I know," he said. "I wear them after you and get hard pretending you've just cum on me."

"I could come on you now,"  I said, as the transexuals on screen began to penetrate a boy they had tied to the bed.

"Yes, daddy, I want you to spray your love on me," my dad said. The drugs must have really been working, because a large, DD set of tits was sprouting from his chest. I slipped my dick between them, brushing the tip against the nipples until it was hard. I then rammed my rock hard cock down my dad's throat, just as five shemales stuck their hard dicks down a boy's cock.

I felt my breasts growing, too. My hips widened. My lips became smaller. A look in the mirror confirmed that I had turned into a girl, except for my dick, which was growing bigger. I had become one of the shemales in the video, the tall black one.

"You're my favorite, daddy," my dad said and I could contain it no longer.

I came all over his face and down his big tits. I covered him with come. Then, I pressed our dicks together and came all over his penis.