Jenny's ears stood up as she saw Martha turn around with a look on her face as though she had just been given an idea.
"Actually Emily" she said, "I'll let you off for today if you promise not to give any answer to what I say next. Ok?"
"Alright" said Emily
"Transform or dare?" said Martha. As she said this, Jenny could feel panic rising in her.
Obediently Emily stayed silent.
"OJ then" said Martha, "You get both. For your transformation you will get closer to your sister. So close that you are part of her, her pussy to be precise, where you shall feel everything Jenny feels down there but doubled. You will still be able to see and talk and you will 'eat' in the same way as Jenny. For your dare you will be unable to change back for a week. After that week you can try to use the curse to change back, assuming you havn't passed it on or decided to stay like that before then. Also, don't worry about everyone else, as far as they are concerned you will have always been like that. This will be our little secret."
Jenny, now coming down from two name induced orgasms, could only stare at Martha in disbelief as she saw her sister slowly fade away and feel her wet crotch change.
Within seconds Emily had gone and Jenny dashed back to her room. Feeling her lower lips move she looked down to see her sister's dark green eyes just above her pussy and she quickly clamped her legs together to muffle the impending scream.
"Hopefully you two will get on together better after this." called Martha from downstairs