Minerva's New Float

"Where is she...?" Erza asked herself upon reaching the center of the room. Looking around with examining eyes. That was when she heard a sudden clatter behind her. She turned with sword emerged; only to watch the entrance seal shut. 

  

"Welcome to your new home Titania." Erza barely had time to react as four chains shot out the ground; each of them attaching themselves to her hands and feet. "Shit...!" Erza mumbled before trying to move away; her body suddenly feeling strange. Her eyes only widened more as she saw a strange magic surge through the chains into her body. 

As she felt her body begin to slow down and feel bloated, someone emerged from the shadows. "You are far to easy to lure out Titania." There stood Minerva, a wicked smile on the witch's face. "Minerva! What is this!?" Erza asked as she felt rather bloated, not noticing her form seemingly increasing in mass.

Upon asking that Minerva chuckled. "Oh just a little forbidden spell I found. Tell me Titania, do you know what it is like to be a balloon?" She asked, causing Erza to look on confused. "What are you squeeeeeee." Erza looked shocked as a loud squeak escaped her lips; her body suddenly sounding as though it was being filled with air. Her form starting to stretch out and turn plastic; armor forming around her and growing as her mass increased rapidly. Her lips sealing shut as her face stretched out; body looking rather fat as she began to float. Body suddenly filled with helium causing this.

"Mmmmm! MMM!" Erza tried to yell, unable to as her entire body turned plastic; breasts rather large as the rest of her body as she floated there like a giant Erza looking balloon. "You see my dear Titania, I wanted to parade around your beaten body during the grand magic tournament. I was unable to due to you beating me. But now  I found a different way to do so~" Minerva's lips curled again into a wicked smile as Erza finished growing, now looking like a giant bloated version of herself floating midair. 

"Mmmm! mmmm. mmmmm...." Erza felt herself grow weaker as the air finished being pumped into her via the chains. Her eyes forced open as her lips formed into a simple smile. The magic finishing its touch as her face joined the rest of her body as plastic; stuck with a simple smile on her face as a happy parade balloon.

With a chuckle Minerva set the chains so that they kept Erza from floating around; the woman rather proud of her work. "You see Titania, you look marvelous from down here. I think I'll try out that idea I had to use you as a blimp later. For now get accustomed to your new home." With a chuckle Minerva made her way out of the warehouse, laughing rather heavily. Leaving her new balloon to wait in the darkness for her owner to return...