(based off the James character in the Tarzan branch)
When you arrive at the park, no one is around. You look around for a few minutes, until you see a figure. It's your buddy James!
"Hey dude!" James calls out, a huge smile on his face, "I see you decided to try on my little present. Excellent!"
You walk up to James, looming over him with your huge body. "Why did you do this James? And how?"
James just laughs. "I found an old book full of all sorts of weird magic spells. I found one that lets me enchant an item of clothing that will transform its wearer!"
"Why me?" you ask, "And why a bodybuilder?"
"I've had a crush on you for a long time," James confesses. "And I've had this huge muscle fetish for as long as I can remember! I just decided to put the two together!"
James is your friend, but you can't help but feel a bit pissed by the way that he tricked you. Still, the whole situation is sort of exciting; you can feel your cock strain against the fabric of those wonderful magic posing trunks that you're wearing under your shorts.
James has noticed the bulge too. He smiles at you. "I have a motel room just around the corner," he suggests.