John sniffs the panties he was wearing as a result of the swap.

John sits like that for a few more seconds, and then collapses onto the floor exhausted and falls asleep. In the morning, he wakes up to a strange squeaking sound. This [Alien Device] has charged up the missing 10 percent overnight by splitting air molecules. In fact, the device could create a nuclear reactor out of anything, but the charging process was probably out of control.

John realized at the first sight of the device that this was no dream. Then he sat down and looked down at himself. He was still wearing the clothes of the girl he had unwittingly tried the device on outside the supermarket.

Then John, a little interested, pulled up his skirt and looked down at his groin. Under the nylon pantyhose he could see a woman's black panties. Then John smiled wryly and sharply removed his panties and panties and held them up to his nose. They had almost lost their scent overnight, but the faint smell of a woman's vagina was still on the panties, though mixed with the smell of John's cock.