Tending to a giant cock

John couldn't see his sister any more but he could definitely feel her squirming in his hands. Where the teenager had been there was now a massive slab of meat so enormous that it was starting to make him feel dizzy. In fact it was getting harder think John wobbled and fell backwards, his massive balls slapping against the wet floor and tilting him awake.

He felt sleepy, like he couldn't...

*snap*

All of a sudden the world felt a lot clearer. John squinted at his enormous cocksister as his brain finally got more oxygen. He hadn't really noticed during the initial transformation. Melanie's entire body had felt so good that he hadn't realised the mathematics of having a 40 plus kilogram cock meant there wasn't much blood to go elsewhere.

He smiled and rubbed his massive member feeling it twitch in response. He wondered how Melanie felt, after all she was still deeply in love with him and now they were completely one person. One person with arguably the largest penis in human history.

He petted the head observing how amazing it felt. John had always had weird fetishes and now his family were going to help him indulge all of them.

Now that he'd made himself a new cock it was time to give Melanie a new body for her trouble, a body that would be permanently linked to her old one. He grinned as he struggled to get to his feet, his beach ball sized testicles forcing him to walk with a duck like gait.

Now that he had Melanie right where she belonged it was time to find his older sister. He'd always wondered what it would feel like to merge with another human being. Emily was going to help him with that.