It was the month of February, and Batman was investigating the fourth ransacked bakery this week. With the help of what little evidence he could gather, and tracing from the Batcomputer, he was able to gather that the suspects most likely to be involved were The Mad Hatter, Toy Maker, and Poison Ivy in some sort of collaboration. 

The timing of this couldn't have been worse for batman though, as his birthday was slowly creeping up on him. And to his annoyance, the Justice League would plan a surprise party for him every single year.

That night, Bruce had a strange fever dream. He felt himself inside of a room, where there was nothing except for a cake in front of him. He picks it up and takes a bite of it. That's when he feels a tingling sensation throughout his entire body, as if he can feel his entire body reshaping itself into something completely different. He woke up in a cold sweat that night, unable to return to sleep.

The next day, after another fruitless day tracking the bakery crimes. He got a message from Superman requesting that he come to the Justice League Society meeting as soon as possible. Despite him knowing exactly what was about to happen, he decided it was pointless to avoid it.

To his unamusement the Justice League had set up a surprise party just like he had expected. Though today he felt a bit on edge at the sight of the cake, due to his dream from earlier. He quickly grabs the cake and yelled out for the other's not to eat it.

Bruce felt his body begin to be consumed by that same tingling sensation has his dream from last night, however this time it started within his chest and groin area. As he felt his pectoral muscles begin to build massive amounts of fat upon them, his rib cage shrunk a bit to accommodate a more feminine frame. he felt his manhood shifting inwardly, inverting itself inside of him and converting the man into a woman. Her hip bone now expanding wider, shifting into one more appropriate for a birthing canal. This in turn gave her butt a smoother transition with her thighs, the fat that was now being added to her ass cheeks to give her a more appealing look to most men. That tingling spread out from the ignition points, to her legs and arms. Her once toned muscular thighs softened, becoming more smooth and pillowy. Her bulky arm muscles melted away giving a skinnier while her broad shoulder converged inward, giving the top of her body a weaker look. She felt her jaw bone convex and shift from a wide strong chin to a more delicate one. The hair atop her head rapidly grew down to her chest, while her eyebrow's lost some volume. Any hair below her nose immediately disintegrated, giving her entire body a younger look. Bruce was now a woman, that's not where it ended however.

Her batsuit, which had an appearance of being far too large for her delicate frame began to shift as well. Her cowl that was used to conceal her identity transformed itself into a nothing more than a maid headband with white ruffles and 2 adorably large bat ears at the top. Her bulletproof chest plate was reduced to a thin gothic piece of cloth, barely covering her giant new breasts. The bat symbol on her chest becoming a red bow on the center of her chest piece. The arm pieces transformed into arm puffs and white gloves. Her utility belt lost all use, being reduced to a gold ring with a short black skirt with cute white ruffled sprouting from it. The pant legs thinned out and became stockings for her to wear and some high heeled shoes. Finally, two hair ties spawned within her hair, giving her childish pigtails. 

The transformation was complete, and Bruce was reduced from a once feared Batman to an adorable looking Bat-Maid. Despite how much humiliation she felt in this moment, her body was compelled to act in its new purpose. She balanced the cake perfectly on one hand, unable to let it fall. 

Bruce had made a critical error. It wasn't eating the cake that caused the transformation. It was touching it.

The rest of the Justice League looked at Bruce, mortified as they too realize they are holding pieces of cake.