How about some hypocritical mutterings

Carlos pondered on what to do, so he watched how Mio would respond first, wondering if she could inspired some ideas in him.

Mio shook her head, still dazed at the confusion of whether or not she was hallucinating her ex or not. She came to the conclusion that she was just daydreaming (with a snap from Carlos, realising why she's so confused), and wanders back to the kitchen, muttering about why the hell she would even think about that scumbag. Carlos overhearing this, thought of something splendid he can do to her.

Mio was always like that, talking bad about anyone she didn't like the look of. While Carlos wasn't the epitome of perfection, he was pretty decent; managing to maintain a clean house while Mio went to work, cooking decent meals without much complaint. But Carlos now realises that Mio just didn't care about him doing these things, thinking him just lazing around. What did she expect, the house cleaned itself? He angrily thought as he remembered all those times that she off-handedly on how lazy he was as he tried to enjoy the breaks he got from doing the chores.

Now that Carlos thinks back, in hindsight this breakup was bound to happen eventually, considering how obvious she was in displaying her unhappiness in idle complaints towards him.

You like talking bad about people? he internally inquired, how about we turn that into talking about yourself.

Carlos went to the kitchen and saw her cleaning the sink, after finishing the dishwashing. Carlos leaned against the doorframe, ready to watch her, and snaps.

Mio suddenly bolts up straight, having this odd sense of unease. Her daydream earlier came back to her mind and wondered why she was thinking about Carlos. She shakes her head, upset that she has to remind herself of her ex. She feels like she needs to talk to herself about the problems she has. Fors some reason that she doesn't realise, she starts talking about it out loud to herself.

"That idiot, he was always staring at other girls, even when I was there." She complains, placing her hands on her hips and reminisces, "He keeps trying to peek at their chests, just because they have balloons for boobs, the pervert." Mio then gasps. She looks down as she feels an odd swelling sensation on her chest. the sound of an inflating balloon reaches Mio's ears coming from her chest as her boobs start inflating. Mio is groaning as the shirt conforms around the growing mammaries, pressing them together and stretching out the stretchy fabric. The rim of the shirt starts raising as they grow, giving her quite the hefty amount of underboob when they finally stop, held up by sheer defiance of gravity to keep her nipples barely hidden by the rim.

Mio angrily groans, wondering why this happened as she looked around for the source. As she does, she feels the jiggling of her new boobies, bouncing around like crazy despite their firmness like a pair of balloons taped to her chest...

Mio thought this description and wondered if it had to do with what she said. She ponders, and tries an experiment, "I have normal B-cup boobs again" And looks down, somewhat hoping it would work, but the offending melons remain large and in charge under her struggling top. Mio stomps in frustration, bouncing unintentionally. Mio then states angrily "Dammit, what's going on? I'm glad Carlos is not here," Mio says, wondering why she's bringing him up, "He'd probably just gawk at them and expect me to be excited about them, maybe even play with them despite me not wanting to." then suddenly, as instant as her boobs growing, Mio's hands raise.

The hands no longer seem to obey her anymore, as they lift up her chest by the bottom, lightly tossing them up and catching them. The hands also prove to Mio that, despite their apparent firmness, they are actually quite soft and plush, so her fingers sink in easily. Mio grunts and moves her shoulders around, in an apparent effort to stop her hands playing with herself as they are now hard groping them like stress balls. Though it doesn't hurt her, Mio hates the arousal she's feeling against her will. Mio opens her mouth trying to tell her hands would stop (as if they would listen) but instead complains more about Carlos, as the person in question is openly laughing at her from the doorway unawares for her.