Everything got off to a good start as Marceline and Bubblegum created an in-lab serum. Marceline actually mixed the ingredients together, and the end result was a gas leak. While the gas was not very toxic, it started to alter the female bodies on their genetic level. Bubblegum as well as Marceline’s breasts began to increase in size. They grew to huge sizes. And odd feelings of being surrounded by something heavy were felt under the skirt. Check out some comics to find out what happens next.