"Compromise" (cock transformation)

You reach over to your bedside table and grab a vile of a pink liquid.

"Drink up~" you whisper to Alex before hugging him and placing the vial's top to his lips. Alex, as is his nature, obeys and slurps it up. When it is empty, you set it back onto your bedside table. You hug him tightly, holding his head to your chest as you do. Your cock throbs within Alex, but you soon feel more than a 7" cock pulsate. You start to feel what he feels, but it isn't reciprocated. His skin is becoming more sensitive.

You lick his face as your dick becomes one with Alex's body. His legs are fusing with your balls already, shrinking and melding with your flesh. After a few moments, your balls are now double the size that they were. You hold him close and he looks down to investigate the strange feeling, but he doesn't protest. He seems into it. His arms quickly melds into his torso as your new urethra forms up through his body and a thick vein creeps up his body.

He's throbbing and a bit of cum is dripping from his mouth and as he throbs, he loses size. Most potions like this shrink them by a certain amount so that while they are still bigger than the original, they aren't an inconvenience. With each throb, he becomes more and more cock shaped. More cylindrical. He becomes about 12 inches long, still throbbing. His head is still human. You start to rub your new dick and when you pull your foreskin over his head, it becomes a cock head.

You stroke your dick, thrusting into your own hand repeated until you reach orgasm. Pumping cum onto your bedsheets. As you finish, you can feel Alex's consciousness still in there.

You clean up and go to sleep.