Katie: lets see what you have in mind, ill choose both
Jenn: glad your on board! For your dare you will let me eat you whole with my cock here. Then you will transform into a goo-girl made of cum! I guess that'd be a cum-girl, haha
Katie then ran and jumped head first into her cockmother. Jenn screamed in joy and pleasure as her giant cock of a mother devoured Katie like a snake until she dropped into her ball sack.
Jenn began to massage her giant ball sack. Churning her sister into cum as her solid body melted into Jizz.
Once Katie was melted Jen began to jack off her mother.
Mom: mmmmm Jenn, you know just were to stroke!
Jenn continued to beat her mother until she came, splattering Katie all over the wall and ceiling.
The cum pooled in the center of the room dripping off the walls and ceiling as a goo-ey piller of jizz rose and shaped into Katie