'Dont come in!' Declan shouted in a strange, almost girly voice.
It was too late.
There in the doorway stood his mother with a shocked look on her face.
'What did you do to your hair Declan?' she asked before realising he was shrinking before her eyes.
'Whats happening to you?'
Declan was now a foot smaller than his mother, his face changing to that of a young girl.
His sister!
His body thinned as he took on the form of a pre-pubescent girl.
Declan struggled to speak, trying to hold up his boxers which began sliding down his legs exposing a much smaller hairless dick.
'It was the medallion,' he said in a now female voice, 'its turning me into...'
'Katie?' his mother cut in, 'You wanted to look like your little sister?'
He was now 8 years old at most, his tiny penis slipping inside his crotch leaving him a smooth bald vagina.
'I was just curious' he stammered in a voice now identical to his sister, 'i wanted to see what it was like.'
The changes stopped, leaving him 7 years old, looking up at his mum.
'But youre younger than Katie' his mum said, 'how can this be?'
He blushed and held up the panties, 'i used these' he said.
Sternly his mother took the medallion, placing it well out of his reach.
'Well' she said 'if thats your wish, thats whats going to happen Declan.'
'No' he said, 'i dont want to be a little girl, i just wanted to see how it feels.'
'Oh you will', she replied, 'youre going to find out exactly how it feels to be a girl!'
Snatching the tiny pink panties she said 'Put these on. We cant have your sisters seeing your girly bits. I hope Katie doesnt mind lending her big brother some of her old clothes.'
'Please dont tell them mum' he cried, realising even Katie would be bigger than him now.