Jeremy took the thong off and stared amazed at the sight in his mirror.
He had gained a thick manly bush, and as he further noticed his penis was also looking a bit longer and a good deal thicker with balls being at least twice what they were earlier.
He removed the rest of his clothes and was shocked to see the rest of him also had changed he had a moderate covering of body hair everywhere where previously he had very little.
It was then that he also noticed how horny he was feeling, so he looked for clothes, planning to get dressed for a night out.
When he opened his closet he found a note on top of his basket of laundry from Nathan that said,
"Hey man sorry again for using all the detergent, I got more and did you a favor and tossed your basket in before I did mine today."
Jeremy surprised by his roommate's gesture, was glad to have some clean clothes to go out tonight, he didn't think much about it at the time, but it was odd for his usually carefree roommate to have done such a thing. Little did he know Nathan's little brother had come to visit him so he just wanted to clean up around the place and leave a good impression, least the little kid say anything to his parents. Jeremy simply got dressed and went out.
Nathan's brother, Jeff, was alone snooping in Nathan's room, he had told him he was hungry so Nathan, not having a car, said he'd walk down to the corner and grab him some McDonalds. Jeff used this as an excuse to stay alone and snoop around to try to find his weed stash, or maybe a porn stash. He knew Nathan was into weed, and being 12 he was curious as well, and always horny. He had stayed quiet while Jeremy had briefly came in, and when he heard him leave went to go make sure no one was still in the place, before he continued to snoop.
As he was checking it is at this time he glanced into Jeremy's room and noticed a small box under the corner of his bed that he knew was his brother's. Of course he'd try to hide his stash when his brother was over, he at least attempted to be a good role model for him. Given that Jeremy was not home long and had just missed Nathan, Jeff knew that he still had a few minutes before his brother would be back, so he had time to swipe a little and stash it elsewhere.
As he went into the room he saw Jeremy's discarded clothes and was particularly drawn to the Thong. He always thought it would be sexy to take a picture of himself wearing a thong and send it to his girlfriend, here was his chance. Of course he knew they were recently used and that was kinda gross, but he thought it might be worth the laugh.