"Oh Cathy will get smaller alright, everytime you have sex with her she will shrink" I told her
Then Sara's grin turned into a smile.
Sara then walks sexily up to Cathy and starts to undress her as well as undressing herself at the same time.
Sara then puts her finger on 1 of Cathy's breasts and said:
"Oh I wish Cathy would feel deeply in love with me and would have sex with me now" Sara said
Cathy then looked down at Sara and smiled, this wish worked mainly because it wasn't a wish but a command due to my last.
I then watched Sara and Cathy feel each other up, it was sick to know that Sara was having sex with her mum but the way she looks at the moment she could be easily mistaken as a damn sexily prostitute.
Sara and Cathy then stopped feeling each other and Sara walked backwards onto the bed with Cathy following, as they both kissed each other.
Sara then brought her lips to Cathy's tits and she then started to lick them, but all Cathy did was stay there and not back away for she was enjoying like mad still not knowing the wishes effect was coming to life.
Sara and Cathy were now the same height as each other when Cathy decided to do the same to Sara as she then started licking Sara's tits.
After a few minutes of watching them have sex with each other I felt really turned on and then Sara lifted her head up and said:
"Come and join us"
And I did, I wished myself to become a female version of myself.
It was only a matter of seconds before I was completly female, my dick had vanished, I had 2 great lumps called breasts on my chest and a new slit where my dick once was.
I then undress myself and I then dive onto the bed and join in.
We then did group sex with each other, like feeling each others tits and licking them to feeling each others pussys.
After finishing the group sex, Cathy was about half our height and thats when me and Sara decided to speed up the process by feeling only her up.
It only took a few minutes before Cathy the adult size woman to becoming tiny thumbalina which is no bigger than one of our thumbs.