(Ill try n keep descriptions short too)
Jennifer: ok Katie, transform or dare?
Katie: both!
Jennifer: you will transform into a diaper who will make anyone who wares you have to pee and crap an unlimited amount, for your dare you have to hold every bit if it without breaking!
Katie's arms and legs folded into her body which stretch into the shape of a diaper, with her face set into the crotch. Jenn placed her around her legs and pulled the her sister up to her body, emiditly her bladder filled and released urine into Katie's face wich turned yellow and swelled in size.
Jennifer: like being a toilet Katie?
Katie (in a gurgled voice):yes! It's all warm and sloshy, it feels so good!
Jennifer: ready for the main course?
Katie's face slid from the crotch over the arms and onto her rear
Katie: let her rip sis!
Jenn bent her knees as she felt her bowls fill and with a ripping fart began to fill the diaper with shit. Katie's face stretched and swell with the diaper as it began to stain brown all while she giggled happily. She grew and grew until the diaper was so full it lifted Jenn off the floor.
Jennifer: how's that sis?
Katie: *mmmhmmmmmhmmhhhmh*
Jennifer: ok, your turn
The diaper unfolded into Katie, the shit and urine disappeared.
Katie: transform or dare?
Jennifer: both!
Katie: for your transform you will transform into a tentical monster. For your dare you will have sex with anyone who enters the room.
Jennifer's body exploded into a mass of slimy tenticals. Her eyes poped out of her head on stalks like a snail and her mouth stretched into a vagina but could still talk.
She scooped Katie into the air with her many tenticals, Katie had just enough time to scream for help before Jennifer shoved tenticals into ever orphas of her body!
Katie: MOM! HELP ME!
Mom: Katie? What's wrong? OH MY GOD!
Jenn swiped her mother into the air and began filling her and Katie with tenticals. Making bulged in their bellies and filling them with fluid, she played with them for about an hour before she decided to eat her mother, she stuffed her deep inside her mouth vagina and swallowed.
Jenn then shrank back to normal but with a gient bulge in her stomach from eating her mom.
Katie: so how did mom taste?