(This is a reimagining of an idea I posted under an old account several years ago.)
The world is in an interesting place, full of unique people. Everyone goes about their lives, many staying within what would be considered possible and normal.
Sam was not one of those people.
When Sam was a teenager, he discovered quite by accident that he had some rather... interesting capabilities. He had known he was gay since a fairly early age, so it came as no surprise to him that he found many of the guys around him fairly attractive. What DID come to him as a surprise, however, was the time that his fantasizing about the captain of his high school's wrestling team resulted in the unsuspecting jock's cock nearly tripling in size while he showered one afternoon after practice. The man's subsequent nickname, "Big Dick Rick" barely did it justice, and interest in wrestling seemed to go up once it became well-known that most practices following that incident tended to devolve into massive, sweaty orgies.
Though shocked and confused by his abilities at first, Sam gradually came to appreciate and exert more control over them, occasionally making little adjustments to himself and others when he saw it fit. A few pounds of muscle here, an inch or two down below there, a massive, earth-shattering orgas-nevermind, ignore that last one.
Through a combination of solid genetics and a bit of tinkering, Sam now found himself comfortably sitting at around 6'1" and moderately well-muscled, with light brown hair and bright green eyes. He was particularly fond of his 6-inch softie, though he was often open to "adjustments" when he felt so inclined, such as the time he grew himself to nearly 9 feet tall in order to see what "hulking out" might feel like (he found it quite fun, but noted that finding clothes that can contain a man of that size is difficult to say the least, not to mention finding guys who are willing to take a dick the size of their arm).