Standing in front of the door was the mailman. He was holding a package under one arm, looking uncomfortable. Jeff smiled at him, and reached for the package.
The letter carrier had never been a large man. Short and on the thin side, he was wiry and tanned from his work, but otherwise unremarkable.
"Is your dad here?" the letter carrier asked, wiping sweat from his brow, even though it wasn't a hot day.
"Come on in," Jeff invited.
The mailman looked unsure for a moment, but then stepped inside. His clothes looking increasingly tight on his body, as his muscles slowly swelled, getting bigger and harder and more powerful.
"Boy, that shirt sure looks uncomfortable," Jeff murmured softly. The mailman nodded, setting down the package.
"So tight," the growing man muttered, his voice deeper already. Jeff grinned.
"Maybe you should take it off?" the younger male suggested helpfully. But then buttons began to pop off the mailman's shirt, as his swelling pecs pushed through, forcing the shirt to yield, revealing the increasingly deep cleft between the two slabs of muscle.
"What's... going..." The mailman didn't finish the sentence. His eyelids fluttered for a moment, as the virus did its work.
"Want to come up to my room?" Jeff asked, smirking. The mailman, now a hulking bodybuilder, six and a half feet tall at least, grinned and nodded. Jeff led the big man up the stairs, and blushed slightly when he realized the huge brute was staring at his ass the whole time.
Jeff was barely in his room when the mailman shut the door behind them, shoving the horny young teen down onto the bed. The mailman quickly stripped down, pulling off the rest of his too-small uniform, putting a few more holes in it in the process. He was wearing a pair of satin posers underneath it all, black and shiny, highlighting just how massive his cock was. He grinned hungrily at Jeff.