You're invited to a party with a

"big surprise"

so you just had to go. Once you arrive, you see a woman with a huge butt, it doesn't look normal at all.

"You made it girl! Come with me, you gotta try out the big surprise"

. As she leads you to the surprise, you see her butt jiggle and wobble, and stretch her pants out, this can't be normal. You also see some other girls with rather big butts, was the party holding a twerk off or something??

"Here it is! The big surprise!"

The woman said. You see in front of you a giant tank with a mysterious liquid inside... What is going on???