As Cal sits down on his bed, Mark closes the door and the joins Cal on the bed.
Cal stares at he wall directly in front of him, and in a monotone, serious voice, "Hey...I am sorry about what I said back there. I am being selfish. I want to make you happy, and I'll be the most attractive form you desire." Cal looks around the room, and then turns to Mark, "I want to take advantage of the chance we have here. I want to make you happy."
Mark sighs, "Cal, you being here is enough. Your parents and I talked a lot earlier. You looked happy when you and your sister left. We have an opportunity here to be what we want for each other, for the rest of our lives. Yesterday, I had no history of serious relationships, my best friend was a party dude who was happily into girls, and today, I have a canine cock, I am strongly bisexual, and you are the love of my life."
Cal nods, "So, what form are you most attracted to?"
Mark thinks for a moment, "Turn on your computer. Let's go see what we can find." A half-hour later, Mark says, "How about that?"
Cal smiles, "Not bad." Cal puts the collar around his neck. Mark has a loose grip on the dildo.
Cal keeps his eyes locked on the computer display, concentrating on the form, as Mark whispers into his ear. Mark uses one hand to undo the collar, and slides the canine dildo into Cal's ass, and quickly settles into a rapid thrusting into Cal's ass. Mark watches as Cal's body changes, his legs thin slightly, his hips and ass slightly expand, the hair on the top of his head grows rapidly, nearly white blond in color, and his upper chest seems to inflate into two rather large, round DD breasts. Cal's lips feel puffy while his face softens to match the one on the computer. Mark slows the pace of thrusting the dildo into Cal as he notices a large, hairless scrotum slowly drop into view. Mark smiles, and slowly pulls the dildo out of Cal.
"Why did you stop, I was still building to an orgasm" says a feminine voice coming out of Cal's mouth.
"It worked, go look at a mirror." smiled Cal. Cal walked over to a small mirror by his desk and looked at his new body. "I would so do my body right now if I were you. The huge breasts turned out great, and I have to admire the canine pussy between my balls and sheath. And the Jennifer Love Hewitt face on the Anna Kournakova body was a nice touch." says a turned on Cal. His cock quickly emerging from its sheath. Cal stepped back to Mark, and slowly turned around, allowing Mark a full survey of his body.
"This way, both Ginger and Buster can enjoy your company." smiled Mark.
"And you." Cal quickly responded.
"Yea, I like being both. Your parents made sure of that." nodded Mark.
"I love having a body that makes us both want to jack off." as Cal slowly reached down to massage his new canine cock.
Mark got up and went back to the bed, "Come on over here. We got all night."
The next morning, Cal went into the kitchen to get a drink, and saw his sister making coffee. "Wow, we need to go back to that club." she said. "I thought you wanted to be a man with a dog pussy?" she asked.
Cal said, "I am Mark's idea of a wet dream. This morning, he becomes my version. Plus, I am glad to have a cock again. They both have their benefits." Cal pours two glasses and walks back to his room. As Cal walked away, he heard his sister quietly say, "My wet dream too...", and that was music to Cal's ears.