Zach (only name I can think of right now) went over to his closet and dug around for a minute before he found what he was looking for: His girl friend's white cotton panties.
He quickly ran back to his desk and, carefully, picked the amulet up in the panties and touched it to his arm. A jolt ran through his arm and the rest of his body at the touch, and he quickly put the amulet down on the table. Zach ran over to the full length mirror on his closet - hey, he likes to look at himself - to watch the changes.
The changes started slowly, mostly in his face and hair as they took on a feminine appearance, his eyes turning from brown to green and his hair growing long, quickly giving him his girl friend's face. Soon after that the transformation sped up, starting at his hands and feet and working its way up. His arms and legs got thinner, his legs and fingers lengthening, his whole body becoming more slender. Zach dropped from his previous 5' 10" height down to a mere 5' even. When the transformation reached his hips, he dropped his pants, not wanting them to hurt his new hips. Quickly, he lifted his now very loose shirt up and saw his penis and balls slide into his body, leaving a naturally hairless slit behind. His hips flared out, his waist thinned and his two mounds grew on his chest, a firm pair of B-cup breasts. The transformation was far to fast for Zach's liking, but he didn't care about that, now that he had a clear view of his girlfriend's slit.
Zach grinned. There was something he always wanted to see his girlfriend do...