After a battle against the villains and saving the day, Camie Utsushimi aka Illus-o-Camie and Yu Takeyama aka Mt. Lady fixing the building with the help of the citizens and construction workers for a few hours in the afternoon. After helping out, the two heroines were exhausted, panting until they heard someone clapping at them. It was Rico coming towards them to show gratitude for their efforts to save the city.

Rico: bravo heroes. You both did very well saving the city from villains.

Yu: *smiles* thank you, it was nothing bud. My name is Yu Takeyama

Camie: *panting and chuckles* just saving the day like usual. I'm Camie Utsushimi, it's nice to meet you.

Rico: it's nice to meet you girls. I'm Rico, I got a reward for you both to try out. Come follow me, you both will love it.

Yu: nice, can't wait to get a reward from you. I wanna see it so bad right now!

Camie: same, let's go get the reward!

The trio go out for a walk together, going to the store to buy a few balloons that are yellow and has the letter "P" planted on them. They go out of the store, looking around somewhere more open for them to try out the balloons, walking to the open field for more space. Rico passed out one balloon to Camie and passed two balloons to Yu.

Rico: alright, these are P balloons. They'll give you special power once you pop.

Yu: alright, let's try out these new abilities to show off!
*Pops the two P balloons*

Camie: This is really awesome! It's going to be a good use for my quirk!
*Pops the P balloon*

Rico: yes, yes. This is going to be fun hehehe~.

Camie: what do you mean by fun Rico? I honestly feel bloated.

Yu: same, what was in those balloons?

Rico: let's say a little magic that'll have effects on your bodies~.

Camie and Yu both look at him with confused expression until they felt their bellies swelling up, stretching out their elastic hero outside, feeling it tight around their bodies with their butts and thighs expanding, wobbling around. Camie gasp a bit, feeling her arms and legs getting puffy and merging into her spherical body while Yu gets a lot more larger and rounder with her cheeks swelling up and was too round to move her limbs that are now gone in her body. Rico smiles seeing his favorite two heroines are now round and spherical balloons as the P balloon magic as finished Inflating them.

Camie: woah! I honestly didn't expect this to be my new power.

Yu: *muffled* mmph... I'm so round.. I can't move anymore.

Rico: pretty cool right? The P balloons inflate you once you pop them. You both look amazing like this~.

Yu: *muffled* well I do gotta say, it's not too bad Rico. I feel really relaxed~. *Giggles and blushes*

Camie: yeah, I'm kinda liking it right now. We totally deserved it after a long day of saving the city~.

Rico: nice. You both really do deserve a break. Let me play with you two~.

He raised his hands up, giving them a big hug, rubbing their inflated bodies, making them giggle. Camie waddle with her tiny feet, pushing him closer against Yu's Inflated belly while she rock back and forth, giggling to feel Camie's smaller, round body against her larger, round body. Rico chuckles, feeling their warm bodies squishing him as he grab a balloon string, tying it up on Camie's wrist, and climb up on Yu's round body onto her back.

Rico: I have an idea that we can go bounce around for fun on Yu's back~.

Camie: that sounds really fun while I float above to enjoy the breeze~.

Yu: *muffled* hehe, now this is getting very interesting. Hang on tight little cutie, this is going to be a bouncy ride~.

Rico' ok, here we go~.
*Hang onto her large ballooned butt.*

Camie: I'm going to enjoy this so much. Let me cuddle you dear~.
*Floats close to him and pressed her Inflated belly and breasts behind his back.*

Rico smiles, cuddling her back, hearing her body squeaking and creaking while Yu gently start bouncing on the ground, feeling her body wobbling under him as he cuddles up on her large butt, feeling how really soft they are from the inflation. The trio would enjoy their time having fun bouncing around and Rico was happy to see his two favorite heroines enjoy their new infla- I mean new powers that gave him a lot of joy to play with them on their break.