Deciding to take the most logical and safest route, John picked Amy's cousin's clothes. As easy as it could have been for him to impersonate her sister, he figured the risk of messing something up with pretending to be her (she was a popular soccer star who almost all the girls in town knew personally) or having her turn up to the party later on despite her inability to attend (canceled plans or some other unfortunate occurrence) was too great to challenge.
He had never known Amy even HAD a cousin, but he had known Amy long enough to trust her that she was actually trying to help him. Clenching the medallion in his palm, he reached out a single finger and almost touched the "Harvard" sweatshirt. However, before he did, he looked up at Amy once more. "So, your cousin's from Massachusetts?" "No, Delaware. She just attends." John nodded. It seemed like a safe bet. Since they were in the middle of Illinois, there was little chance that Amy's cousin would show up unexpectedly. Far less chance of that over her sister showing up, anyway. However, John had one more question:
"Why the hell do you have your cousin's clothes on standby?" Amy shrugged, her arms folded. "She left them here after a visit last year. We found out about it after she was already on her flight home, so we're holding onto it until she visits again. Look, do you want to do this or not? We're going to be late." John nodded, and touched the sweatshirt, the medallion still tucked away in his hand. Suddenly, a warm blue light enveloped John's vision, and very single nerve in his body began to tingle. It didn't hurt, but it didn't feel good, either. John cried out instinctively as the buzzing sensation overtook his body and his vision became entirely cobalt. However, no sound came out, and within seconds John could feel himself changing.
His short brown hair turned into long, red locks. His skinny, masculine physique became curvy and feminine. His above-average sized penis, foreskin and all (John's parents were devoutly Christian, and didn't believe in going with the surgery upon his birth, which he was very thankful for) shrank into a slightly fuzzy vulva with red hairs attached to it. His slightly flabby pectoral muscles gave way to large, squishy mounds of flesh with pink nipples and tan freckles covering them. They were large, roughly EE-cups, and made his Death-Star T-shirt stretch out and sag. His feet shrank, his hands grew more slender, his neck grew longer, his body become that of a 20-year-old, et cetera. Finally, after five seconds that fleet like minutes to John, he collapsed to the floor, exhausted and in shock. Amy looked at him, worried. "John, you okay, man?"
John opened his eyes, shocked by what had just happened. His boxer shorts felt strange without any testicles touching the fabric, and his Adam's apple was nowhere to be found. However, despite all this (along with one of his favorite Star Wars shirts being ruined), he felt amazing. "Hey, Amy!", he said enthusiastically, a mature female voice escaping his throat. He stood up, and looked at himself in the mirror. Amazed, he started to laugh, with Amy nodding behind him. "Yeah, see? Told you I wasn't lying. So, how do you feel?" John squeezed his breasts, making Amy chuckle and roll her eyes. "Bouncy", he replied, jostling them up and down underneath his shirt. Amy gently punched his arm with a smirk, and grabbed her cousin's clothes. "So, I'll give you a few minutes to change in here by yourself. I'll keep watch outside so nobody enters." John nodded, and Amy left the room. John took his shirt off, and began to stare at himself in the mirror. He felt..... warm, down there. He knew it was his body (well, not his body, but Amy's cousin's body), but he felt aroused by it. John had long been a fan of large breasts, and these ones were no exception. Picking up the Harvard sweatshirt, he began to...