''Heh heh heh...'' Amy giggled, looking down at her shrunken older sister, ''I could have so much fun with this...''
Megan didn't like the look in Amy's eyes.
''With the power I have over you, sis, you'd have to do everything I say, wouldn't you?''
Megan gulped.
''Yup, that's right!'' Amy laughed fiendishly, ''I can make you... Do... Anything.''
Two huge hands clamped down on her shoulders, and Megan felt herself getting picked up with sheer ease.
''Shrink! Shrink! Grow! Shrink! Grow! Grow! Shrink! Grow! Shrink!''
Still clamped in her sister's hands, Megan felt rather nauseous after her size changing rollercoaster ride. After all of that, she was even smaller now, at just 16 inches tall!
''So, are you ready to play, 'little' sis?'' Amy threatened, her blue eyes sparkling impishly.
''Put me down, Amy!'' Megan cried, ''You can't do this to me!''
''Oh? I can't?'' she laughed derisively, ''who's gonna stop me?''
'Mom will!' Megan considered saying, but something told her Amy hd thought of that already.
''Heh. Thought not.'' Amy chuckled, sweeping her black hair from her eyes, ''So it looks like you're my little slave then, huh?''
''And slaves do whatever their mistress tells them to.''
''No! NO!'' Megan screamed, flailing against her sister's superior strength.
''Yes YES!'' Amy bellowed, bringing her lips right up to her sister's face, to the point where her breath blew Megan's hair back, ''Or do I have to say that word again?''
Megan stopped struggling immediately, ''...no.''
''Then you'll do it?''
''...yes.''
''Perfect!'' Amy laughed, planting a face devouring kiss upon her sister, ''Alright slave, you got yourself a deal. If you behave, I might even say the other word! But you'll always be smaller than me, and always be my slave, got it?!''
''...got it.'' Megan sighed, ready to face the worst.
''Heh heh, perfect...'' Amy laughed, ''Alright slave, I give you your first task!''
Megan's fears grew to new heights when Amy...