Your dad enters his bedroom and begins to put together his gym bag. You remain in constant darkness. You are surprised that you have zero control over what happens as your Dad's penis. You thought maybe you could make him erect or get him horny, but you remain absolutely powerless. At the mercy of his own nervous system.
You hear your dad zip his gym bag up and he begins to make his way to the car. His underwear is snug so you remain tight pressed up against his thigh resting on his scrotum.
"How you feelin' down there buddy? Nice and comfortable?" your Dad says as he reaches down to adjust you as he sits down into the car.
You can say nothing. You lie helpless in your dad's crotch.
You get just a glimpse of light as your dad lowers his underwear in the locker room and all 6 inches of you flops out into the open air. As your dad reaches down to give you a quick scratch you flop to the side and see a locker room full of naked men. You are by far the largest penis.
Your dad grabs a towel and makes his way to the dry sauna. He remains naked as he sits down on the bench in the heated room.
"This is how things are when you are a dick, son. Enjoy my sweaty musk down there."
Your dad was right. There is nothing you can do. As the temperature rises you feel your body begin to sag and fill with blood. You hang low with your dad's testicles resting on the wooden bench. Sweat forms across your glans and you feel your father's heartbeat pulse throughout your body.
A man in his early twenties enters the sauna and sits on the opposite bench. You can still see as you selected that option with your transformation and you see the guy checking out your father's body. The stranger begins to stroke his own cock and you begin to feel yourself involuntarily gorge and fill with hormones from your father. You hear your father softly chuckle "You didn't think I'd be putting you in your mother, did you?"
Your dad continues to play with you and you grow to nearly 10 inches against your will. The young man smiles from across the sauna. Your dad asks him "Mind if my boy and I say hello?" He laughs and reaches out to give you a squeeze. You are horrified. This is not what you expected.
You are amazed at how your own father's hormones flood your mind and body. The blood gorges your body and your face, or now glans, are filled to the max and precum is dripping from your mouth. You want to be inside his mouth now, you want to thrust your entire body deep into his sexy ass. Your dad's wants and desires are now yours.
As the stranger takes you into his mouth you pulse with excitement. You can't believe you've turned from a heterosexual teen to a fully gay or maybe bisexual male. You no longer have a brain so what do you really know? Your dad takes hold of you with a firm wiggle and says my boy wants more. Before you know it your face is being pressed through his anus and with several manly thrusts you feel your entire body tense and semen shoot through your core out of your mouth. You come to rest deep in his anus. Where you never imagined you'd be.