On their fun day inside of the large mansion with Rico opening the door to see one of his best friend, Ryuko Matoi that comes inside, giving him a playful noogi on his head. He looks up at her eyes, patting her head gently, making her giggle. Ryuko then give Rico kisses on his cheek, and carry him in her arms while they walk through the hallway.

Ryuko: sup, my little man. Did you miss me~?

Rico: I missed you a lot, Mommy Ryuko. It's been a while since I've inflated you and your sister~.

Ryuko: *chuckles* I will never forget that day on the fourth of July when we were big balloons for you. Do you have any plans for us~?

Rico: I have a lot of ideas in mind. Let's go to the kitchen to try out some gummies~.

Ryuko carries him to the kitchen to try out the special candy he has in stock for her. As they got in the kitchen, she grabs a jar full of gummies, grabbing some in her hand, and put it in her mouth, tasting its sweet and sour flavor. Rico looks up at her with a hint of mischief, excited to see her expand from the gummies.

Rico: those gummies are going to inflate your body once you consume them, Mommy. How do you feel~?

Ryuko: I feel pretty bloated. I love how the gummies taste too. Can't wait to expand like a balloon for you, baby~.

Rico: I know right? It seems like you're belly is already expanding~.

Ryuko: nice. I'm filling up with air very well~.

She smirks, looking down at her belly that's inflating with air, stretching out her shirt along with her butt and thighs expanding, lifting up her skirt to show her panties. Rico giggles, enjoying seeing her inflating a lot more bigger, hugging her Inflated belly, and felt her breasts expanding in his face, smothering him. Ryuko laughs, feeling her arms and legs expanding, spreading out as the inflation stop, becoming semi inflated, and giving Rico a big hug, cuddling with him.

Ryuko: this feels so amazing to be inflated, baby. I love being your big balloon Mommy so much~.

Rico: hehe, this is going to be so fun to play with you, Mommy Ryuko. It makes my little peepee so hard seeing you like this~.

Ryuko: *smirks* if that's the case, then we should go have a lot more fun in the living room. Hop on my back, baby~.

Rico: yes, Mommy. Waddle your way to the living room~.

He walks behind her, hugging her big, inflated butt cheeks, groping her from behind as he would lift her skirt up, nuzzling his face between her inflated cheeks. Ryuko moans softly, bending down more for him to hug her from behind, feeling him clinging onto her back as she begins to waddle out of the kitchen, through the hallway, and finally made it to the living room. She would bend down again, feeling him pulling her panties down to reveal her Inflated pussy that's pulsing a bit, feeling his tiny member getting in her deep, gasping from their sexual activity.

Rico: I want to do this to you for a while, Mommy Ryuko. You seem very turned on~.

Ryuko: *panting* fuck yes I'm turned on, baby. You're filling Mommy up so good~.

Rico: good, Mommy. I'll keep filling you up more with my little peepee~.

Ryuko: keep going for Mommy. I need more of you~!

Rico continues to pound her more, feeling her large butt bouncing on his body, squishing him against the couch as he reaches to play with her inflated breasts, teasing her perky nipples that's getting hard, leaking milk on the palm of his hands. Ryuko's moans grew louder, having her tongue sticking out, panting due to her inflated body being so sensitive, getting close to her climax that's going to erupt like a volcano at any moment.

Ryuko: oh yes, Rico. I don't think I can hold it much longer... You're going to love me spraying all over you~.

Rico: yes, Mommy Ryuko. I would love to taste your juice a lot and your big boobies after I release all of my love~.

Ryuko: let it all out for me, baby. Mommy need your love in her womb now~.

Rico: *moans softly* it's going to come out, Mommy... Here it comes~!

He thrust in her a lot more faster, teasing her inflated clit that made her eyes roll back in her head, seeing her now squirting all over him as he finally release his seed, filling her up completely. Rico taste her juice, slowly getting out of her, and cuddles on top of her Inflated belly to suck on her nipple for her milk. Ryuko panting from their taboo, hugging him tightly in a warm embrace, patting his head gently as she continues to nurse him.

Ryuko: you did very good, baby. Mommy will feed you milk~.

Rico: mmmm, thank you, Mommy Ryuko. That was amazing of us doing this together. You're a really cool balloon Mommy.

Ryuko: *chuckles* I'm glad to be your big balloon Mommy for today, sweety. I really love this moment so much. Now, relax on top of me and continue drinking Mommy's milk~.

Rico: ok, Mommy Ryuko~.

He continues to suckle on her nipple, tasting her sweet and creamy milk while patting her inflated belly like a drum, and groping her other breast, switching to her other nipple to suck on it. Ryuko panting more, getting turned on to feel him sucking on her more, rubbing his back as she loves her role of being his big, balloon Mommy for today which was really worth it.