"Here let me show you!"
Mary grabs Brad by the arm and drags him to the box of vials. There were many options and Mary showed him the vial that she drank from. It was now refilled and waited to be ingested.
Brad brought the vial to his lips and slurped down the contents. Like Mary he did not feel any different or notice any immediate changes.
He saw the bottle of cola on Mary's table and decided to pour himself a glass. The cold liquid looked very refreshing. He felt the tingle of the bubbly soft drink as he gulped the soda.
"Maybe it doesn't work on guys?" Mary thought out loud.
Just then Brad grunted and felt his genitals stretch. His balls filled and expanded to the size of grapefruits and his penis also doubled in girth and lengthened a few inches. He could feel the fizzy contents inside of him and he was ready to burst. He took a step towards Mary and he could feel the drink unsettling and start to fizz more inside his balls. He stroked his new massive cock and it was vibrating slowly. He jerked off quickly and soda shot out of his penis across the room all over Mary's living room.
Mary wanted to feel that powerful penis and it's sweet load inside of her. And without much time at all she was on top of Brad riding his cock. She could barely move down the shaft because her pussy was too tight. Brad insisted with a strong grasp around her waist and pulled her down the rest of the way.
"Oh my fuck! You're too big!"
Brad shook violently back and forth inside of her and within moments they both came, but Brad shot his cola fizzy load deep inside of Mary, and it was so strong that it traveled up her body and quickly filled her mouth that she couldn't contain. She had a fountain of cola shooting from her lips as she tried to keep everything inside.
Jer boobs inflated again with cola and they were both shooting cola all over Mary's house. Soon Brad was empty and back to his normal size when he thought maybe he could try another liquid.